Zilog Z80180 - Manual (Page 157)

Z8018x
Family MPU User Manual
142
UM005003-0703
Table 19. ASCI Baud Rate Selection
Prescaler
Sampling
Rate Baud Rate
General
Divide
Ratio
Baud Rate (Example)
(BPS) CKA
PS
Divide
Ratio
DR Rate
SS2 SS1 SS0 Divide
Ratio
f = 6.144
MHz f = 4.608
MHz f = 3.072
MHz
I/O
Clock
Frequency
0 f ¸ 10
0 16
0 0 0 ¸1 f ¸ 160 38400 19200 f ¸ 10
0 0 1 2 320 19200 9600 20
0 1 0 4 640 9600 4800 40
0 1 1 8 1280 4800 2400 0 80
1 0 0 16 2560 2400 1200 160
1 0 1 32 5120 1200 600 320
1 1 0 64 10240 600 300 640
1 1 1 — fc ¸ 16 — — — I fc
1 64
0 0 0 ¸1 0 ¸640 9600 4800 f ¸ 10
0 0 1 2 1280 4800 2400 20
0 1 0 4 2560 2400 1200 40
0 1 1 8 5120 1200 600 0 80
1 0 0 16 10240 600 300 160
1 0 1 32 20480 300 150 320
1 1 0 64 40960 150 75 640
1 1 1 — fc ¸ 64 — — — I fc