Scc/escc user manual – Zilog Z80230 User Manual
Page 254

SCC/ESCC
User Manual
UM010903-0515
Application Notes
247
Test Program–Z180/SCC DMA Transfer (Continued)
db
01h
;select WR1
db
01100000b
;REQ on Rx
db
02h
;select WR2
db
00h
;00h as vector base
db
03h
;select WR3
db
11000000b
;Rx 8bit/char
db
05h
;select WR5
db
01100000b
;tx 8bit/char
db
06h
;select WR6
db
00h
;
db
07h
;select WR7
db
00h
;
db
09h
;select WR9
db
00000001b
;stat low, vis
db
0ah
;select WR10
db
00000000b
;set as default
db
0bh
;select WR11
db
01010110b
;
;
0
No xtal
;
1010
TxC,RxC from BRG
;
110
TRxC = BRG output
db
0ch
;select WR12
db
00h
;BR TC Low
db
0dh
;select WR12
db
00h
;BR TC high
db
0eh
;select WR14
db
00010110b
;
;
000
nothing about DPLL
;
1
Local loopback
;
0
No local echo
;
1
DTR/REQ is req
;
1
BRG source = PCLK
;
0
Not enabling BRG yet
db
0eh
;select WR14
db
00010111b
;
;
000
nothing about DPLL
;
1
Local loopback
;
0
No local echo
;
1
DTR/REQ is REQ
;
1
BRG source = PCLK
;
1
Enable BRG
db
03h
;select WR3
db
11000001b
;rx enable