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PDF MPC89E51A Data sheet ( Hoja de datos )
| Número de pieza | MPC89E51A | |
| Descripción | 8-bit micro-controller | |
| Fabricantes | Megawin Technology | |
| Logotipo |  |
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MPC89x51A
8-bit micro-controller
Features .................................................................................................................................. 2
General Description ............................................................................................................... 3
Order Information: ................................................................................................................. 3
Pin Description....................................................................................................................... 4
Pin Definition................................................................................................................. 4
Pin Configuration........................................................................................................... 6
Block Diagram ....................................................................................................................... 7
Special Function Register ...................................................................................................... 8
Memory.................................................................................................................................. 9
Organization................................................................................................................... 9
Nonvolatile Registers:.................................................................................................. 10
RAM ............................................................................................................................ 11
Embedded Flash........................................................................................................... 12
Functional Description......................................................................................................... 13
TIMERS/COUNTERS................................................................................................. 13
TIMER0 (T0) AND TIMER1 (T1) ...................................................................... 15
TIMER2 ............................................................................................................... 16
Interrupt........................................................................................................................ 20
Watchdog Timer........................................................................................................... 22
www.DataSheet4U.coSmerial IO Port (UART) ................................................................................................. 23
Reset............................................................................................................................. 26
Power Saving Mode and POF...................................................................................... 26
In System Programming (ISP) ..................................................................................... 27
In-Application Program ............................................................................................... 31
Note for Other SFR...................................................................................................... 32
Absolute Maximum Rating (MPC89E51A) ........................................................................ 33
DC Characteristics (MPC89E51A)...................................................................................... 33
Absolute Maximum Rating (MPC89L51A) ........................................................................ 34
DC Characteristics (MPC89L51A)...................................................................................... 34
Package Dimension.............................................................................................................. 35
Revision History .................................................................................................................. 38
This document contains information on a new product under development by Megawin. Megawin reserves the right to change or discontinue this
product without notice.
© Megawin Technology Co., Ltd. 2008 All rights reserved.
2008/12 version A11
MEGAWIN
1 page  
P3.5 (T1)
15 17 11
P3.6 (/WR)
16
18
12
P3.7 (/RD)
17
19
13
keep the port high. Port3 also serves
other special functions of this device.
P3.0 and P3.1 act as receiver and
transceiver of the data for UART function
block,
Alias RXD and TXD.
P3.2 and P3.3 also act as external
interrupt sources, alias INT0 and INT1.
P3.4 and P3.5 also act as event sources
for timer0 and timer1 individually, alias
T0 and T1.
P3.6 also acts as write signal while
access to external memory, alias /WR.
P3.7 also acts as read signal while
access to external memory, alias /RD.
P4.0
P4.1
P4.2 (/INT3)
23 17 BU Port4 is extended I/O ports such like
34 28
1 39
Port1. It can be available only on
44L-PLCC and 44L-PQFP package.
P4.3 (/INT2)
12 6
RESET
9 10 4 IS A high on this pin for at least two
machine cycles will reset the device.
ALE 30 33 27 O Output pulse for latching the low bytes of
address during accesses to external
memory.
www.DataSheet4/PUS.coEmN
29 32 26 O The read strobe to external program
memory, low active.
/EA 31 35 29 I EA must be kept at low to enable the
device to fetch program code from
external flash memory.
An internal pull-up resistance has been
embedded in this pin.
XTAL1
19 21 15 I Input to the inverting oscillator amplifier.
XTAL2
18 20 14 O Output from the inverting amplifier.
VDD
40 44 38 P Power Supply
VSS
20 22 16 G Ground
MEGAWIN
MPC89x51A Data Sheet
5
5 Page 
NVM register: OR1 (Option Register 1):
Bits-7
Bits-6
Bits-5
Bits-4
FZWDTCR
OSCDN
Bits-3
Bits-2
Bits-1
HWBS
Bits-0
EN6T
FZWDTCR: Used to freeze the WDT-controlling register.
0:= Configure the SFR WDTCR to be reset only via power-up action; not by software
reset nor reset from the Watch Dog Timer.
1:= (default) Permit all the reset events from power-up, software and the Watch Dog Timer
could reset the SFR WDTCR.
OSCDN: Used to adjust the behavior of crystal oscillator.
0:= The DC gained of crystal oscillator amplifier is doubled but bandwidth is reduced. It will bring
help to EMI reducing and improve the power consumption. Dealing with application, it does
not need high frequency clock (under 20MHz). It is recommended to do so.
1:= The gained of crystal oscillator is enough for oscillator to start oscillating up to 48 MHz.
HWBS: Used to configure the MPC89x51A boot from ISP program or normal application program after the
power-on sequence.
0:= The MPC89x51A will boot from ISP start address after power-on.
1:= No operation. The MPC89x51A will boot from normal application program.
EN6T: Used to configure the MPC89x51A run in 6T 12T mode or 6T mode.
0:= The MPC89x51A will run in 6T mode
1:= The MPC89x51A will run in 12T mode
The default value of the OR1 is FFh.
RAM
There are 512 bytes RAM built in MPC89x51A.
www.DataSheet4U.com
The user can visit the leading 128-bytes RAM via direct addressing instructions, we have named
those RAM as direct RAM that occupies address space 00h to 7Fh.
Followed 128-bytes RAM can be visited via indirect addressing instructions, we have named
those RAM as indirect RAM that occupied address space 80h to FFh.
The other 256-bytes RAM is named expanded RAM that still occupied address space 00h to FFh.
An user can access it via general register Ri, or via data pointers DPTR associated with MOVX
instructions, say MOVX A, @R1 or MOVX A, @DPTR. To reserve the natural characteristic of
instruction MOVX which is designed to access external memory, the user can set the bits ERAM
in SFR AUXR as 1, and by doing so is to hide the expanded RAM and to visit the external
memory.
MEGAWIN
MPC89x51A Data Sheet
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MPC89E51A.PDF ] | |
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