UPD78F0138 NEC, UPD78F0138 Datasheet - Page 192

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

192
Cautions 1. When the Ring-OSC clock is selected as the clock to be supplied to the CPU, the clock of the
Remarks 1. f
Address: FF8CH
Symbol
TCL51
2. Figures in parentheses apply to operation at f
2. When rewriting TCL51 to other data, stop the timer operation beforehand.
3. Be sure to set bits 3 to 7 to 0.
X
Ring-OSC oscillator is divided and supplied as the count clock. If the count clock is the Ring-
OSC clock, the operation of 8-bit timer/event counter 51 is not guaranteed.
: X1 input clock oscillation frequency
TCL512
7
0
0
0
0
0
1
1
1
1
After reset: 00H
Figure 7-6. Format of Timer Clock Selection Register 51 (TCL51)
CHAPTER 7 8-BIT TIMER/EVENT COUNTERS 50 AND 51
TCL511
6
0
0
0
1
1
0
0
1
1
R/W
TCL510
User’s Manual U16228EJ2V0UD
5
0
0
1
0
1
0
1
0
1
TI51 falling edge
TI51 rising edge
f
f
f
f
f
f
X
X
X
X
X
X
/2 (5 MHz)
/2
/2
/2
/2
(10 MHz)
4
6
8
12
(625 kHz)
(156.25 kHz)
(39.06 kHz)
4
0
(2.44 kHz)
X
= 10 MHz.
3
0
Count clock selection
TCL512
2
TCL511
1
TCL510
0