Z8018x
Family MPU User Manual
UM005004-0918
143
Baud Rate Generator
(Z8S180/Z8L180-Class Processors Only)
The Z8S180/Z8L180 Baud Rate Generator (BRG) features two modes.
The first is the same as in the Z80180. The second is a 16-bit down
counter that divides the processor clock by the value in a 16-bit time
constant register, and is identical to the DMSCC BRG. This feature allows
1
φ
÷
30
0
16
0
0
0
÷
1
φ
÷
480
9600
φ
÷
30
0
0
1
2
960
4800
60
0
1
0
4
1920
2400
120
0
1
1
8
3840
1200
0
240
1
0
0
16
7680
600
480
1
0
1
32
15360
300
960
1
1
0
64
30720
150
1920
1
1
1
—
fc
÷
16
—
—
—
I
fc
1
64
0
0
0
÷
1
φ
÷
1920
2400
φ
÷
30
0
0
1
2
3840
1200
60
0
1
0
4
7680
600
120
0
1
1
8
15360
300
0
240
1
0
0
16
30720
150
480
1
0
1
32
61440
75
960
1
1
0
64
122880
37.5
1920
1
1
1
—
fc
÷
64
—
—
—
I
fc
Table 19. ASCI Baud Rate Selection (Continued)
Prescaler
Sampling
Rate
Baud Rate
General
Divide
Ratio
Baud Rate (Example)
(BPS)
CKA
PS
Divide
Ratio
DR Rate
SS2 SS1 SS0 Divide
Ratio
φ
= 6.144
MHz
φ
= 4.608
MHz
φ
= 3.072
MHz
I/O
Clock
Frequency
Содержание Z8018 Series
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