w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 65

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

GP7
GP7
GP7
GP7
13.2 Serial I/O 2
2
1
0
/S
/S
/S
3
/S
CLK2
OUT2
IN2
/INT
X
RDY2
X
The serial I/O2 function can be used only for clock synchronous serial I/O. For clock
synchronous serial I/O, the transmitter and the receiver must use the same clock If the internal
clock is used, transfer is started by a write signal to the serial I/O2 register.
CIN
S
IN
Main clock divide ratio
Selection bits (Note)
21
RDY2
Serial I/O2 port selection bit
Serial I/O2 port selection bit
output enable bit
P7
“0”
“1”
3
P7
P7
latch
“0”
“0”
“1”
“1”
2
1
S
latch
latch
RDY2
“10”
“00”
“01”
Synchronization
circuit
Serial I/O2 synchronous
Clock selection bit “1”
Fig.12.5 Serial I/O 2 Function Block Diagram
External clock
- 56 -
Serial I/O counter 2(3)
Serial I/O2 register (8)
“0”
1/8
1/16
1/32
1/64
1/128
1/256
Internal synchronous
Clock selection bits
W83L950D
Serial I/O2
Interrupt request