NEC Figure 8-3. Timer Clock Selection Register 0 Format

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CHAPTER 8 16-BIT TIMER/EVENT COUNTER
CLOE TCL06 TCL05 TCL04 TCL03 TCL02 TCL01 TCL00
76543210Symbol
TCL0
TCL03TCL02 TCL01 TCL00
0000f
XT (32.768 kHz)
0101f
XX f X (5.0 MHz) f X /2(2.5 MHz)
0110f
XX /2 f X /2 (2.5 MHz) f X /2
2
(1.25 MHz)
0111f
XX /2
2
f X /2
2
(1.25 MHz) f X /2
3
(625 kHz)
1000f
XX /2
3
f X /2
3
(625 kHz) f X /2
4
(313 kHz)
1001f
XX /2
4
f X /2
4
(313 kHz) f X /2
5
(156 kHz)
1010f
XX /2
5
f X /2
5
(156 kHz) f X /2
6
(78.1 kHz)
1011f
XX /2
6
f X /2
6
(78.1 kHz) f X /2
7
(39.1 kHz)
1100f
XX /2
7
f X /2
7
(39.1 kHz) f X /2
8
(19.5 kHz)
MCS = 1
PCL Output Clock Selection
MCS = 0
FF40H 00H R/W
Address After Reset R/W
Other than above Setting prohibited
TCL06TCL05 TCL04
0 0 0 TI00 (Valid edge specifiable)
0012f
XX Setting prohibited f X (5.0 MHz)
010f
XX f X (5.0 MHz) f X /2(2.5 MHz)
011f
XX /2 f X /2(2.5 MHz) f X /2
2
(1.25 MHz)
100f
XX /2
2
f X /2
2
(1.25 MHz) f X /2
3
(625 kHz)
1 1 1 Watch timer output (INTTM 3)
MCS = 1
16-Bit Timer Register Count Clock Selection
MCS = 0
Other than above Setting prohibited
CLOE
1 Output enabled
PCL Output Control
0 Output disabled
Figure 8-3. Timer Clock Selection Register 0 Format
Cautions 1. The valid edge of pin TI00/INTP0 is set with the external mode register 0 (INTM0). Also,
the frequency of the sampling clock is selected with 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 timer operation beforehand.