AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 298

• Manufacturer Part Number: AT91SAM7X128
• Description: MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
• Manufacturer: Atmel

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

T
29.6.4
Register Name:
Access Type:
• CLDIV: Clock Low Divider
The SCL low period is defined as follows:
• CHDIV: Clock High Divider
The SCL high period is defined as follows:
• CKDIV: Clock Divider
The CKDIV is used to increase both SCL high and low periods.
298
T
low
high
=
=
31
23
15
(
–
–
7
(
(
CLDIV
(
CHDIV
AT91SAM7X512/256/128 Preliminary
TWI Clock Waveform Generator Register
×
×
2
CKDIV
2
CKDIV
30
22
14
TWI_CWGR
Read-write
–
–
6
)
+
)
+
3 )
3 )
×
×
T
MCK
T
MCK
29
21
13
–
–
5
28
20
12
–
–
4
CHDIV
CLDIV
27
19
11
–
–
3
26
18
10
–
2
CKDIV
25
17
–
9
1
6120H–ATARM–17-Feb-09
24
16
–
8
0