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Chapter 9
16-Bit Interval Timer M
User’s Manual U16702EE3V2UD00
9.3 Control
Register
(1)
TMM0 timer control register (TM0CTL0)
The TMM0 timer control register (TM0CTL0) is an 8-bit register used to control the timer
operation.
This register can be read and written in 8-bit or 1-bit units.
RESET input clears this register to 00H.
The same value can always be written to the TM0CTL0 register by software.
Figure 9-3:
TMM0 Timer Control Register (TM0CTL0) Format
Caution:
Bits TM0CKS2 to TM0CKS0 can be rewritten when TM0CE = 0.
However, bits TM0CKS2 to TM0CKS0 and bit TM0CE are mapped to the same
register.
Therefore, when changing the value of TM0CE from 0 to 1, it is also possible to
change the value of bits TM0CKS2 to TM0CKS0.
Remark:
f
XX
:
Internal system clock frequency
f
RING
: Ring-OSC frequency
Symbol
<7>
6
5
4
3
2
1
0
Address
R/W
After
reset
TM0CTL0 TM0CE
0
0
0
0
TM0CKS2 TM0CKS1 TM0CKS0 FFFFF690H R/W 00H
TM0CE
Internal clock operation enable/disable specification
0
Disable internal operating clock operation (asynchronously reset TMM0).
1
Enable internal operating clock operation.
The TM0CE bit controls the internal operating clock and asynchronously resets TMM0.
When this bit is cleared to 0, the internal operating clock of TMM is stopped (fixed to the low
level), and TMM0 is asynchronously reset.
When the TM0CE bit is set to 1, the internal operating clock is enabled within two input
clocks, and the timer counts up.
TM0CKS2
TM0CKS1
TM0CKS0
Internal count clock selection
0
0
0
f
XX
0
0
1
f
XX
/2
0
1
0
f
XX
/4
0
1
1
f
XX
/64
1
0
0
f
XX
/512
1
0
1
f
XX
/32
1
1
0
f
XX
/8
1
1
1
f
RING
electronic components distributor
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