AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 351

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

T
30.10.5
Name:
Access:
Reset Value: 0x00000000
TWI_CWGR is only used in Master mode.
• CLDIV: Clock Low Divider
The SCL low period is defined as follows:
• CHDIV: Clock High Divider
The SCL high period is defined as follows:
T
• CKDIV: Clock Divider
The CKDIV is used to increase both SCL high and low periods.
low
high
=
=
31
23
15
(
–
7
(
(
CLDIV
(
CHDIV
TWI Clock Waveform Generator Register
TWI_CWGR
Read-write
×
×
2
CKDIV
2
CKDIV
30
22
14
–
6
)
+
)
+
4 )
4 )
×
×
T
MCK
T
MCK
29
21
13
–
5
28
20
12
–
4
CHDIV
CLDIV
27
19
11
–
3
26
18
10
–
2
SAM7S Series [DATASHEET]
CKDIV
6175M–ATARM–26-Oct-12
25
17
–
9
1
24
16
–
8
0
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