Z80180 Datasheet, PDF (157/326 Pages) Zilog, Inc. – Z8018x Family MPU

Z 8018x Fam ily
M PU Us e r M anual
142
Table 19. ASCI Baud Rate Selection
Sampling
Prescaler
Rate
Baud Rate
Divide
SS2 SS1 SS0 Divide
PS Ratio DR Rate
Ratio
General
Divide
Ratio
Baud Rate (Example)
(BPS)
φ= 6.144 φ= 4.608 φ= 3.072
MHz
MHz MHz
CKA
Clock
I/O Frequency
000
÷ 1 φ÷ 160 38400
19200
φ÷ 10
001
2
320 19200
9600
20
010
0 16
011
4
640
9600
8
1280
4800
4800
40
2400 0
80
0 φ÷ 10
100
101
110
111
000
001
16
2560
32
5120
64 10240
— fc ÷ 16
÷ 1 0÷ 640
2
1280
2400
1200
600
—
9600
4800
1200
600
300
—
—I
4800
2400
160
320
640
fc
φ÷ 10
20
010
4
2560
2400
1200
40
1 64 ^{0 1 1}
100
101
8
5120
16 10240
32 20480
1200
600
300
600 0
80
300
160
150
320
110
64 40960
150
75
640
111
— fc ÷ 64
—
—
—I
fc
UM005001-ZMP0400