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9. Timers
Register Configuration
Table 9.3 shows the register configuration of timer A.
Table 9.3
Timer A Registers
Name
Timer mode register A
Timer counter A
9.2.2
Register Descriptions
Timer Mode Register A (TMA)
Bit
TMA7
Initial value
Read/Write
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.
Bits 7 to 5—Clock Output Select (TMA7 to TMA5): Bits 7 to 5 choose which of eight clock
signals is output at the TMOW pin. The system clock divided by 32, 16, 8, or 4 can be output in
active mode and sleep mode. A 32.768 kHz signal divided by 32, 16, 8, or 4 can be output in
active mode, sleep mode, and subactive mode.
Bit 7: TMA7
Bit 6: TMA6
0
0
1
1
0
1
Rev.3.00 Jul. 19, 2007 page 212 of 532
REJ09B0397-0300
Abbr.
TMA
TCA
7
6
5
TMA6
TMA5
0
0
0
R/W
R/W
Bit 5: TMA5
0
1
0
1
0
1
0
1
R/W
Initial Value
R/W
H'10
R
H'00
4
3
⎯
TMA3
TMA2
1
0
⎯
R/W
Clock Output
φ/32
φ/16
φ/8
φ/4
φ
/32
W
φ
/16
W
φ
/8
W
φ
/4
W
Address
H'FFB0
H'FFB1
2
1
TMA1
TMA0
0
0
R/W
R/W
R/W
(initial value)
0
0
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