HD404318 Datasheet, PDF (34/68 Pages) Hitachi Semiconductor – 4-bit HMCS400-series microcomputer

HD404318 Series
Timer A interrupt
request flag
(IFTA)
System
clock
ø_PER
Selector
Prescaler S (PSS)
Timer
counter A
(TCA) ^Overflow
3
Timer mode
register A
(TMA)
Figure 22 Timer A Block Diagram
Timer mode register A (TMA: $008)
Bit
Initial value
Read/Write
Bit name
3
—
—
Not used
2
0
W
TMA2
1
0
W
TMA1
0
0
W
TMA0
Source Input clock
TMA2 TMA1 TMA0 Prescaler frequency
0
0
0 PSS
1 PSS
1
0 PSS
1 PSS
1
0
0 PSS
1 PSS
1
0 PSS
1 PSS
2048t_cyc
1024t_cyc
512t_cyc
128t_cyc
32t_cyc
8t_cyc
4t_cyc
2t_cyc
Figure 23 Timer Mode Register A (TMA)
32