178
4. Register configuration
Table 9.3 shows the register configuration of timer A.
Table 9.3
Timer A Registers
Name
Abbrev.
R/W
Initial Value
Address
Timer mode register A
TMA
R/W
H'10
H'FFB0
Timer counter A
TCA
R
H'00
H'FFB1
Clock stop register 1
CKSTPR1
R/W
H'FF
H'FFFA
Subclock output select register
CWOSR
R/W
H'FE
H'FF92
9.2.2
Register Descriptions
1. Timer mode register A (TMA)
Bit
Initial value
Read/Write
7
TMA7
0
R/W
6
TMA6
0
R/W
5
TMA5
0
R/W
4
—
1
—
3
TMA3
0
R/W
0
TMA0
0
R/W
2
TMA2
0
R/W
1
TMA1
0
R/W
TMA is an 8-bit read/write register for selecting the prescaler, input clock, and output clock.
Upon reset, TMA is initialized to H'10.