Datasheet

Section 10 Timer A
Rev.5.00 Nov. 02, 2005 Page 133 of 418
REJ09B0028-0500
10.3 Register Descriptions
Timer A has the following registers.
• Timer mode register A (TMA)
• Timer counter A (TCA)
10.3.1 Timer Mode Register A (TMA)
TMA selects the operating mode, the divided clock output, and the input clock.
Bit Bit Name
Initial
Value R/W Description
7
6
5
TMA7
TMA6
TMA5
0
0
0
R/W
R/W
R/W
Clock Output Select 7 to 5
These bits select the clock output at the TMOW pin.
000: φ/32
001: φ/16
010: φ/8
011: φ/4
100: φ
w
/32
101: φ
w
/16
110: φ
w
/8
111: φ
w
/4
For details on clock outputs, see section 10.4.3, Clock
Output.
4  1  Reserved
This bit is always read as 1.
3 TMA3 0 R/W Internal Clock Select 3
This bit selects the operating mode of the timer A.
0: Functions as an interval timer to count the outputs of
prescaler S.
1: Functions as a clock-time base to count the outputs of
prescaler W.