Z85233 Datasheet, PDF (74/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

SCC™/ESCC™ User’s Manual
SCC/ESCC Ancillary Support Circuitry
External
3
Crystal
/SYNC Pin
B
R 16x
Output
TxC
G
/RTxC Pin
RxC
/TRxC Pin
SCC
Figure 3-11. Async Clock Setup Using an External Crystal
WR11
D7
D0
1 101 0110
WR14
D1
0
/TRxC OUT = BRG Output
/TRxC Pin = Output Pin
Tx Clock = BRG Output
Rx Clock = BRG Output
Using External Crystal
NRZ Data
SYNC
RxD Pin
TxC
Modem 1x
RxC
/RTxC Pin _SCC
Figure 3-12. Clock Source Selection
BRG Clock Source = /RTXC
or XTAL OSCILLATOR
UM010901-0601
3-13