w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 61

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

(f(X
f(X
GP44/RXD
GP45/TXD
Transmit or receive clock
GP46/SCLK1/OBF10
IN
IN
)
) in low speed mode)
Transmit buffer write
Serial output TxD
Serial input RxD
receive buffer read
ST detector
signal
Character length selection bit
signal
BRG count source selection bit
TBE=0
Character length selection bit
TSC=0
TBE=1
Serial I/O1 synchronous clock selection bit
1/4
ST
ST
OE
7 bits
8 bits
D
D
0
0
Fig.12.4 UART Serial I/O 1 Function Operation
TBE=0
D
D
Address 0018
1
1
Fig.12.3 UART Serial I/O Diagram
1 start bit
7 or 8 data bit
1 or 0 parity bit
ST/SP/PA generator
Transmit shift register
Transmit buffer register
Receive shift register
Receive buffer register
Data bus
PE
Data bus
Frequency division ratio 1/(n*1)
Baud rate generator
FE
16
- 52 -
Address 001C
Address 0018
SP detector
RBF=1
Serial I/O1 control register
SP
SP
1/16
TBE=1
16
16
ST
ST
Serial I/O1 status register
Transmit Interrupt source selection bit
D
D
Receive buffer full flag (RBF)
Receive Interrupt request (RI)
0
0
RBF=0
*Generated at 2nd bit in 2-stop-bit mode
D
D
Transmit shift completion flag (TSC)
1
1
Address 001A
W83L950D
Address 0019
Transmit buffer empty flag (TBE)
Transmit interrupt request (TI)
1/16
18
UART control register
16
RBF=1
TSC=1*
SP
SP