W83195R-08 データシートの表示（PDF） - Winbond
部品番号
コンポーネント説明
一致するリスト
W83195R-08 Datasheet PDF : 18 Pages
| |||
W83195R-08
Bytes sequence order for I2C controller :
PRELIMINARY
Clock Address
A(6:0) & R/W
Ack
8 bits dummy
Command code
Ack
8 bits dummy
Byte count
Ack
Byte0,1,2...
until Stop
Set R/W to 1 when read back the data sequence is as follows [1101 0011] :
Clock Address
A(6:0) & R/W
Ack
Byte 0
Ack
Byte 1
Ack
Byte2, 3, 4...
until Stop
8.3 SERIAL CONTROL REGISTERS
The Pin column lists the affected pin number and the PowerUp column gives the default state at true
power up. "Command Code" byte and "Byte Count" byte must be sent following the acknowledge of
the Address Byte. Although the data (bits) in these two bytes are considered "don't care", they must
be sent and will be acknowledge. After that, the sequence described below (Register 0, Register 1,
Register 2, ....) will be valid and acknowledged.
8.3.1 Register 0: CPU Frequency Select Register (default = 0)
Bit @PowerUp
Pin
Description
7
0
-
0 = ¡Ó0.25% Spread Spectrum Modulation
1 = ¡Ó0.5% Spread Spectrum Modulation
6
0
-
SSEL2 (for frequency table selection by software via I2C)
5
0
-
SSEL1 (for frequency table selection by software via I2C)
4
0
-
SSEL0 (for frequency table selection by software via I2C)
3
0
-
0 = Selection by hardware
1 = Selection by software I2C - Bit 6:4, 2
2
0
-
SSEL3 (for frequency table selection by software via I2C)
1
0
-
0 = Normal
1 = Spread Spectrum enabled
0
0
-
0 = Running
1 = Tristate all outputs
Note : The frequency table selected by software via I2C is the same as the hardware setting
frequency table.
Publication Release Date: Mar. 1999
-7-
Revision 0.30
Share Link: 