HD404369 Datasheet, PDF (58/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404369 Series
Timer mode register A (TMA: $008)
Bit
Initial value
Read/Write
Bit name
3
0
W
TMA3
2
0
W
TMA2
1
0
W
TMA1
0
0
W
TMA0
TMA3
0
1
TMA2
0
TMA1
0
1
1
0
1
0
0
1
1
0
1
Source Input Clock
TMA0 Prescaler Frequency Operating Mode
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Don't
care
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSS
PSW
PSW
PSW
PSW
PSW
Inhibited
2048t_cyc
1024t_cyc
512t_cyc
128t_cyc
32t_cyc
8t_cyc
4t_cyc
2t_cyc
32t_Wcyc
16t_Wcyc
8t_Wcyc
2t_Wcyc
1/2t_Wcyc
Timer A mode
Time-base
mode
PSW and TCA reset
Notes: 1. t_Wcyc = 244.14 µs (when a 32.768-kHz crystal oscillator is used)
2. Timer counter overflow output period (seconds) = input clock period (seconds) × 256.
3. The division ratio must not be modified during time-base mode operation, otherwise an overflow
cycle error will occur.
Figure 37 Timer Mode Register A (TMA)
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