SAM7S128 Atmel Corporation, SAM7S128 Datasheet - Page 347
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
SAM7S128
Manufacturer Part Number
SAM7S128
Description
Manufacturer
Atmel Corporation
Specifications of SAM7S128
Flash (kbytes)
128 Kbytes
Pin Count
64
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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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.
6175L–ATARM–28-Jul-11
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
CKDIV
25
17
–
9
1
24
16
–
8
0
347
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