AT91SAM7A3-AU Atmel, AT91SAM7A3-AU Datasheet - Page 186

• Manufacturer Part Number: AT91SAM7A3-AU
• Description: IC ARM7 MCU FLASH 256K 100LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7A3-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, MMC, SPI, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 62
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Controller Family/series: AT91SAM7xx
• No. Of I/o's: 62
• Ram Memory Size: 32KB
• Cpu Speed: 60MHz
• No. Of Timers: 3
• Rohs Compliant: Yes
• Package: 100LQFP
• Device Core: ARM7TDMI
• Family Name: 91S
• Maximum Speed: 60 MHz
• Operating Supply Voltage: 3.3 V
• Data Bus Width: 32 Bit
• Number Of Programmable I/os: 62
• Interface Type: CAN/SPI/I2S/TWI/USART/USB
• On-chip Adc: 2(8-chx10-bit)
• Number Of Timers: 3
• Processor Series: AT91SAMx
• Core: ARM7TDMI
• Data Ram Size: 32 KB
• Maximum Clock Frequency: 60 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91SAM-ICE, AT91-ISP, AT91SAM7A3-EK
• Minimum Operating Temperature: - 40 C
• Cpu Family: 91S
• Device Core Size: 32b
• Frequency (max): 60MHz
• Total Internal Ram Size: 32KB
• # I/os (max): 62
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 100
• Package Type: LQFP
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7A3-EK - KIT EVAL FOR AT91SAM7A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

25.4.2.6
25.4.3
25.4.3.1
25.4.3.2
6042E–ATARM–14-Dec-06
Transmitter
Receiver Framing Error
Transmitter Reset, Enable and Disable
Transmit Format
parity bit. If different, the parity error bit PARE in DBGU_SR is set at the same time the
RXRDY is set. The parity bit is cleared when the control register DBGU_CR is written with the
bit RSTSTA (Reset Status) at 1. If a new character is received before the reset status com-
mand is written, the PARE bit remains at 1.
Figure 25-8. Parity Error
When a start bit is detected, it generates a character reception when all the data bits have
been sampled. The stop bit is also sampled and when it is detected at 0, the FRAME (Framing
Error) bit in DBGU_SR is set at the same time the RXRDY bit is set. The bit FRAME remains
high until the control register DBGU_CR is written with the bit RSTSTA at 1.
Figure 25-9. Receiver Framing Error
After device reset, the Debug Unit transmitter is disabled and it must be enabled before being
used. The transmitter is enabled by writing the control register DBGU_CR with the bit TXEN at
1. From this command, the transmitter waits for a character to be written in the Transmit Hold-
ing Register DBGU_THR before actually starting the transmission.
The programmer can disable the transmitter by writing DBGU_CR with the bit TXDIS at 1. If
the transmitter is not operating, it is immediately stopped. However, if a character is being pro-
cessed into the Shift Register and/or a character has been written in the Transmit Holding
Register, the characters are completed before the transmitter is actually stopped.
The programmer can also put the transmitter in its reset state by writing the DBGU_CR with
the bit RSTTX at 1. This immediately stops the transmitter, whether or not it is processing
characters.
The Debug Unit transmitter drives the pin DTXD at the baud rate clock speed. The line is
driven depending on the format defined in the Mode Register and the data stored in the Shift
Register. One start bit at level 0, then the 8 data bits, from the lowest to the highest bit, one
optional parity bit and one stop bit at 1 are consecutively shifted out as shown on the following
RXRDY
PARE
FRAME
DRXD
RXRDY
DRXD
S
S
D0
D0
D1
D1
D2
D2
D3
D3
D4
D4
D5
D5
D6
D6
Wrong Parity Bit
D7
D7
AT91SAM7A3 Preliminary
P
P
Detected at 0
Stop Bit
stop
stop
RSTSTA
RSTSTA
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