Renesas H8/3847R Series Hardware Manual page 626

Appendix B Internal I/O Registers
TMA—Timer Mode Register A
Bit 7
TMA7
Initial value 0
Read/Write R/W
Clock output select*
φ/32
0 0 0
φ/16
0 0 1
φ/8
0 1 0
φ/4
0 1
1
φ /32
1 0 0
W
φ /16
1 0 1
W
φ /8
1 1 0
W
φ /4
1 1 1
W
Note * Values when the CWOS bit in CWOSR is cleared to 0. When the CWOS bit is set to 1,
φw is output regardless of the value of bits TMA7 to TMA5.
Rev. 6.00 Aug 04, 2006 page 588 of 680
REJ09B0145-0600
6 5
TMA6 TMA5
0 0
R/W R/W
Internal clock select
TMA3 TMA2 TMA1
0 0 0
0 0 0
0 0 1
0 0 1
0 1 0
0 1 0
0 1 1
0 1 1
0 0
1
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
H'B0
4 3
— TMA3 TMA2
1 0
— R/W R/W
Prescaler and Divider Ratio
TMA0 or Overflow Period
φ/8192
0 PSS
φ/4096
1 PSS
φ/2048
0 PSS
φ/512
1 PSS
φ/256
0 PSS
φ/128
1 PSS
φ/32
0 PSS
φ/8
1 PSS
0
PSW 1 s
1 PSW 0.5 s
0 PSW 0.25 s
1 PSW 0.03125 s
0 PSW and TCA are reset
1
0
1
Timer A
2 1 0
TMA1 TMA0
0 0 0
R/W R/W
Function
Interval
timer
Time
base
(when
using
32.768 kHz)