HD6433802H Datasheet, PDF (192/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

3. Register configuration
Table 9.2 shows the register configuration of timer A.
Table 9.2 Timer A Registers
Name
Timer mode register A
Timer counter A
Clock stop register 1
Abbrev.
R/W
TMA
R/W
TCA
R
CKSTPR1
R/W
Initial Value
—
H'00
H'FF
Address
H'FFB0
H'FFB1
H'FFFA
9.2.2 Register Descriptions
1. Timer mode register A (TMA)
Bit
7
6
5
—
—
—
Initial value
—
—
—
Read/Write
W
W
W
4
3
2
1
0
— TMA3 TMA2 TMA1 TMA0
1
0
0
0
0
—
R/W
R/W
R/W
R/W
TMA is an 8-bit read/write register for selecting the prescaler, and input clock.
Bits 7 to 5: Reserved bits
Bits 7 to 5 are reserved; only 0 can be written to these bits.
Bit 4: Reserved bit
Bit 4 is reserved; it is always read as 1, and cannot be modified.
174