AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 288
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AT91SAM7X128
Manufacturer Part Number
AT91SAM7X128
Description
MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
Manufacturer
Atmel
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X128
Package
100LQFP
Device Core
ARM7TDMI
Family Name
91S
Maximum Speed
55 MHz
Ram Size
32 KB
Program Memory Size
128 KB
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Program Memory Type
Flash
Number Of Programmable I/os
62
Interface Type
CAN/Ethernet/SPI/I2S/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
3
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29.5.6
288
AT91SAM7X512/256/128 Preliminary
Read/Write Flowcharts
The following flowcharts shown in
page
give examples for read and write operations. A polling or interrupt method can be used to check
the status bits. The interrupt method requires that the interrupt enable register (TWI_IER) be
configured first.
Figure 29-13. TWI Write Operation with Single Data Byte without Internal Address
290,
Figure 29-16 on page
(CLDIV, CHDIV, CKDIV) in TWI_CWGR
- Device slave address (DADR)
Set the Master Mode register:
291,
Write ==> bit MREAD = 0
TWI_THR = Data to send
Set the Control register:
Load Transmit register
- Transfer direction bit
Read Status register
Read Status register
Figure
(Needed only once)
TWI_CR = MSEN
Transfer finished
- Master enable
TXCOMP = 1?
Set TWI clock
Figure 29-17 on page 292
TXRDY = 1?
Yes
Yes
BEGIN
29-13,
Figure 29-14 on page
No
No
and
Figure 29-18 on page 293
289,
6120H–ATARM–17-Feb-09
Figure 29-15 on
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