AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 405

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

29.6.3
Register Name:
Access Type:
• IADR: Internal Address
0, 1, 2 or 3 bytes depending on IADRSZ. Low significant byte address in 10-bit mode addresses.
29.6.4
Register Name:
Access Type:
• CLDIV: Clock Low Divider
The TWCK low period is defined as follows:
• CHDIV: Clock High Divider
The TWCK high period is defined as follows:
• CKDIV: Clock Divider
The CKDIV is used to increase both TWCK high and low periods.
1768I–ATARM–09-Jul-09
T
T
31
23
15
31
23
15
–
7
–
–
7
low
high
TWI Internal Address Register
TWI Clock Waveform Generator Register
=
=
(
(
(
(
CLDIV
CHDIV
×
30
22
14
30
22
14
×
TWI_IADR
Read/Write
–
6
TWI_CWGR
Read/Write
–
–
6
2
2
CKDIV
CKDIV
)
)
+
+
3 )
3 )
×
×
T
29
21
13
29
21
13
–
5
–
–
5
T
MCK
MCK
28
20
12
28
20
12
–
4
–
–
4
CHDIV
CLDIV
IADR
IADR
IADR
27
19
11
27
19
11
–
3
–
–
3
26
18
10
26
18
10
–
2
–
2
CKDIV
AT91RM9200
25
17
25
17
–
9
1
–
9
1
24
16
24
16
–
8
0
–
8
0
405