NEC Figure 18-2. Timer Clock Select Register 3 Format, Caution When rewriting other data to TCL3 , stop the serial transfer operation beforehand.

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CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-2. Timer Clock Select Register 3 Format
Caution When rewriting other data to TCL3 , stop the serial transfer operation beforehand.
Remarks 1. fXX : Main system clock frequency (fX or fX/2)
2. fX: Main system clock oscillation frequency
3. MCS : Bit 0 of oscillation mode selection register (OSMS)
4. Figures in parentheses apply to operation with fX = 5.0 MHz
Serial Interface Channel 1 Serial Clock Selection
TCL37TCL36 TCL35 TCL34
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
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
f XX /2
8
MCS = 1
Setting prohibited
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)
MCS = 0
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)
f
X /2
9
(9.8 kHz)
Other than above Setting prohibited
65432107
Symbol
TCL3 TCL37 TCL36 TCL35 TCL34 TCL33 TCL32 TCL31 TCL30 FF43H 88H R/W
Address After Reset R/W