NEC Figure 12-3. Timer Clock Select Register 0 Format

258
CHAPTER 12 CLOCK OUTPUT CONTROL CIRCUIT
CLOE
<7>
TCL06
6
TCL05TCL04
4
TCL03
3210
FF40H
Address
TCL0
Symbol
TCL02TCL01 TCL00
5
00H
After
Reset
R/W
R/W
0
0
0
0
1
1
1
1
1
Other than above
0
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
TCL03TCL02 TCL01
f
XT (32.768 kHz)
f
XX
f XX /2
f
XX /2
2
f XX /2
3
f XX /2
4
f XX /2
5
f XX /2
6
f XX /2
7
Setting prohibited
MCS = 1
f X (5.0 MHz)
f
X /2 (2.5 MHz)
f
X /2
2
(1.25 MHz)
f
X /2
3
(625 kHz)
f
X /2
4
(313 kHz)
f
X /2
5
(156 kHz)
f
X /2
6
(78.1 kHz)
f
X /2
7
(39.1 kHz)
MCS = 0
f
X /2 (2.5 MHz)
f
X /2
2
(1.25 MHz)
f
X /2
3
(625 kHz)
f
X /2
4
(313 kHz)
f
X /2
5
(156 kHz)
f
X /2
6
(78.1 kHz)
f
X /2
7
(39.1 kHz)
f
X /2
8
(19.5 kHz)
PCL Output Clock Selection
CLOE
0
1
PCL Output Control
Output disable
Output enable
0
0
0
0
1
1
Other than above
0
0
1
1
0
1
0
1
0
1
0
1
TCL06TCL05 TCL04
TI00 (Valid edge specifiable)
2f
XX
f XX
f XX /2
f
XX /2
2
Watch Timer Output (INTTM3)
Setting prohibited
MCS = 1
Setting prohibited
f
X (5.0 MHz)
f
X /2 (2.5 MHz)
f
X /2
2
(1.25 MHz)
MCS = 0
f
X (5.0 MHz)
f
X /2 (2.5 MHz)
f
X /2
2
(1.25 MHz)
f
X /2
3
(625 kHz)
16-Bit Timer Register Count Clock Selection
TCL00
0
1
0
1
0
1
0
1
0
Figure 12-3. Timer Clock Select Register 0 Format
Cautions 1. Set the TI00/P00/INTP0 pin valid edge by external interrupt mode register 0 (INTM0), and
select the sampling clock frequency by the sampling clock selection register (SCS).
2. When enabling PCL output, set TCL00 to TCL03, then set 1 in CLOE with a 1-bit memory
manipulation instruction.
3. To read the count value when TI00 has been specified as the TM0 count clock, the value
should be read from TM0, not from 16-bit capture/compare register 01 (CR01).
4. When rewriting TCL0 to other data, stop the clock operation beforehand.