NEC 78K0 Series User Manual page 247

(1) 8-bit timer counter 5n (TM5n)
TM5n is an 8-bit register that counts the count pulses and is read-only.
The counter is incremented in synchronization with the rising edge of the count clock.
Address: FF16H (TM50), FF1FH (TM51)
Symbol
TM5n
(n = 0, 1)
In the following situations, the count value is cleared to 00H.
<1> Reset signal generation
<2> When TCE5n is cleared
<3> When TM5n and CR5n match in the mode in which clear & start occurs upon a match of the TM5n and
CR5n.
(2) 8-bit timer compare register 5n (CR5n)
CR5n can be read and written by an 8-bit memory manipulation instruction.
Except in PWM mode, the value set in CR5n is constantly compared with the 8-bit timer counter 5n (TM5n) count
value, and an interrupt request (INTTM5n) is generated if they match.
In the PWM mode, the TO5n pin becomes inactive when the values of TM5n and CR5n match, but no interrupt is
generated.
The value of CR5n can be set within 00H to FFH.
Reset signal generation sets CR5n to 00H.
Figure 8-4. Format of 8-Bit Timer Compare Register 5n (CR5n)
Address: FF17H (CR50), FF41H (CR51)
Symbol
CR5n
(n = 0, 1)
Cautions 1. In the mode in which clear & start occurs on a match of TM5n and CR5n (TMC5n6 = 0), do
not write other values to CR5n during operation.
2. In PWM mode, make the CR5n rewrite period 3 count clocks of the count clock (clock
selected by TCL5n) or more.
Remark n = 0, 1
CHAPTER 8 8-BIT TIMER/EVENT COUNTERS 50 AND 51
Figure 8-3. Format of 8-Bit Timer Counter 5n (TM5n)
After reset: 00H
After reset: 00H
Preliminary User's Manual U17260EJ3V1UD
R
R/W
247