NEC 78K0S/KA1+ Preliminary User's Manual page 132

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(2) Timing chart
The timing of the interval timer/square-wave output operation is shown below.
Count clock
8-bit timer counter H1
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CMP01
TMHE1
INTTMH1
TOH1
<1> The count operation is enabled by setting the TMHE1 bit to 1. The count clock starts counting no more than
1 clock after the operation is enabled.
<2> When the values of 8-bit timer counter H1 and the CMP01 register match, the value of 8-bit timer counter H1
is cleared, the TOH1 output level is inverted, and the INTTMH1 signal is output.
<3> The INTTMH1 signal and TOH1 output become inactive by clearing the TMHE1 bit to 0 during timer H1
operation. If these are inactive from the first, the level is retained.
Remark N = 01H to FEH
132
CHAPTER 8 8-BIT TIMER H1
Figure 8-7. Timing of Interval Timer/Square-Wave Output Operation (1/2)
(a) Basic operation
Count start
00H 01H
<1>
match interrupt occurrence,
8-bit timer counter H1 clear
Preliminary User's Manual U16898EJ1V0UD
N 00H 01H
Clear
N
Interval time
<2>
Level inversion,
N 00H 01H 00H
Clear
<3>
<2>
Level inversion,
match interrupt occurrence,
8-bit timer counter H1 clear