AT91SAM7S128C-MU Atmel, AT91SAM7S128C-MU Datasheet - Page 601

• Manufacturer Part Number: AT91SAM7S128C-MU
• Description: IC MCU ARM7 128K FLASH 64-QFN
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S128C-MU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 128KB (128K 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: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Core: ARM7TDMI
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT91SAM7S128-MU; AT91SAM7S128-MU

40.4.8
40.4.8.1
40.4.8.2
40.4.8.3
6175K–ATARM–30-Aug-10
Two-wire Interface (TWI)
TWI: Clock Divider
TWI: Disabling Does not Operate Correctly
TWI: Software Reset
the data start and one data bit is lost. This problem does not exist when generating a periodic
synchro.
The data need to be delayed for one bit clock period with an external assembly. In the following
schematic, TD, TK and NRST are AT91SAM7S signals, TXD is the delayed data to connect to
the device.
The value of CLDIV x 2
be less than or equal to 8191⋅
None.
when a software reset is performed during a frame and when TWCK is low, it is impossible to ini-
tiate a new transfer in READ or WRITE mode.
None.
Any transfer in progress is immediately frozen if the Control Register (TWI_CR) is written with
the bit MSDIS at 1. Furthermore, the status bits TXCOMP and TXRDY in the Status Register
(TWI_SR) are not reset.
The user must wait for the end of transfer before disabling the TWI. In addition, the interrupts
must be disabled before disabling the TWI.
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
CKDIV
must be less than or equal to 8191, the value of CHDIV x 2
AT91SAM7S Series Preliminary
CKDIV
must
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