PDF AT43USB320A Data sheet ( Hoja de datos )

Número de pieza	AT43USB320A
Descripción	Missed Watchdog Timer Reset
Fabricantes	ATMEL Corporation
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No Preview Available ! Features • AVR® 8-bit RISC Microcontroller with 83 ns Instruction Cycle Time • USB Hub with One Attached and Four External Ports • USB Function with Two Programmable Endpoints • External Program Memory, 512-byte Data SRAM • 32 x 8 General Purpose Working Registers • 32 Programmable I/O Port Pins • Programmable Serial UART • Master/Slave SPI Serial Interface • One 8-bit Timer/Counter with Separate Pre-scaler • One 16-bit Timer/Counter with Separate Pre-scaler and Two PWMs • External and Internal Interrupt Sources • Programmable Watchdog Timer • 6 MHz Oscillator with On-chip PLL • 5V Operation with On-chip 3.3V Power Supply • 100-lead LQFP Package Description The Atmel AT43USB320A is an 8-bit microcontroller based on the AVR RISC architec- ture. By executing powerful instructions in a single clock cycle, the AT43USB320A achieves throughputs approaching 12 MIPS. The AVR core combines a rich instruc- tion set with 32 general-purpose working registers. All 32 registers are directly connected to the ALU allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code effi- cient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The AT43USB320A features an on-chip 512-byte of datwawwm.DaetaSmheoet4rUy.c.omIt is supported by a standard set of peripherals such as timer/counter modules, watchdog timer and inter- nal and external interrupt sources. The major peripheral included in the AT43USB320A is the USB Hub with an embedded function for use in peripherals such as monitor with remote control as shown in Figure 1. Note: There are two versions of the AT43USB320A. They are indicated by the internal part numbers 55618D and 55618E. The only difference between the two versions is in the polarity of the SUSPEND pin. The 55618D SUSPEND pin is active low, while the 55618E SUSPEND pin is active high. Full-speed USB Microcontroller with an Embedded Hub AT43USB320A Rev. 1443E–USB–4/04 1 1 page AT43USB320A Signal Description Name Type VCC VSS CEXT1, 2 Power Supply/Ground Power Supply/Ground Power Supply/Ground XTAL1 XTAL2 LFT Input Output Input DPO DMO DP[1:4] Bi-directional Bi-directional Bi-directional DM[1:4] PA[0:7] PB[0:7] Bi-directional Bi-directional Bi-directional PC[0:7] PD[0:7] Bi-directional Bi-directional TESTN SUSPEND Input Output Function 5V Power Supply Ground External Capacitors for Power Supplies – High quality 0.33 µF capacitors must be connected to CEXT1 and 2 for proper operation of the chip. Oscillator Input – Input to the inverting oscillator amplifier. Oscillator Output – Output of the inverting oscillator amplifier. PLL Filter – For proper operation of the PLL, this pin should be connected through a 0.01 µF capacitor in parallel with a 100Ω resistor in series with a 0.22 µF capacitor to ground (VSS). Both capacitors must be high quality ceramic. Upstream Plus USB I/O – This pin should be connected to CEXT1 through an external 1.5 kΩ. Upstream Minus USB I/O Downstream Plus USB I/O – Each of these pins should be connected to VSS through an external 15 kΩ resistor. DP[1:4] and DM[1:4] are the differential signal pin pairs to connect downstream USB devices. Downstream Minus USB I/O – Each of these pins should be connected to VSS through an external 15 kΩ resistor. Port A[0:7] – Bi-directional 8-bit I/O port with 4 mA drive strength. Port B[0:7] – Bi-directional 8-bit I/O port with 4 mA drive. PB[0,1,4:7] have dual functions as shown below: Port Pin Alternate Function PB0 T0, Timer/Counter0 External Input PB1 T1, Timer/Counter1 External Input PB4 SSN, SPI Slave Port Select or SCL, I2C Serial Bus Clock PB5 MOSI, SPI Slave Port Select Input PB6 MISO, SPI Master Data In, Slave Data Out PB7 SCK, SPI Master Clock Out, Slave Clock In Port C[0:7] – Bi-directional 8-bit I/O port with 4 mA drive strength. Port D[0:7] – Bi-directional I/O ports with 4 mA drive strength. PD[0:3,5] have dual functions as shown below: Port Pin Alternate Function PD0 RXD, Serial Input Port PD1 TXD, Serial Input Port PD2 INT0, External Interrupt 0 PD3 INT1, External Interrupt 1 PD5 OC1A Timer/Counter1 Output Compare A Test Pin – This pin should be tied to ground. Suspend – This pin is asserted when the AT43USB320A enters the Suspend status. In the 55618D, it is active low and in the 55618E and later versions, it is active high. 1443E–USB–4/04 5 5 Page Table 2. SRAM Organization Register File R0 R1 R30 R31 I/O Registers $00 $01 $3E $3F AT43USB320A Data Address Space $0000 $0001 $001E $001F $0020 $0021 $005E $005F Internal SRAM $0060 $0061 $025E $045F USB Registers $1F00 $1FFE $1FFF 1443E–USB–4/04 11 11 Page

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