UPD78F0138 NEC, UPD78F0138 Datasheet - Page 215
UPD78F0138
Manufacturer Part Number
UPD78F0138
Description
(UPD78xxxx) 8-Bit Single-Chip Microcontrollers
Manufacturer
NEC
Datasheet
1.UPD78F0138.pdf
(558 pages)
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(2) Timing chart
8-bit timer counter Hn
<1> The count operation is enabled by setting the TMHEn bit to 1. The count clock starts counting no more than
<2> When the values of 8-bit timer counter Hn and the CMP0n register match, the value of 8-bit timer counter Hn
<3> The INTTMHn signal and TOHn output become inactive by clearing the TMHEn bit to 0 during timer Hn
Remark n = 0, 1
The timing of the interval timer/square-wave output operation is shown below.
Count clock
1 clock after the operation is enabled.
is cleared, the TOHn output level is inverted, and the INTTMHn signal is output.
operation. If these are inactive from the first, the level is retained.
INTTMHn
CMP0n
TMHEn
N = 01H to FEH
TOHn
Figure 8-10. Timing of Interval Timer/Square-Wave Output Operation (1/2)
<1>
00H
Count start
01H
CHAPTER 8 8-BIT TIMERS H0 AND H1
User’s Manual U16228EJ2V0UD
match interrupt occurrence,
8-bit timer counter Hn clear
(a) Basic operation
Level inversion,
N
N
<2>
Clear
00H
01H
Interval time
match interrupt occurrence,
8-bit timer counter Hn clear
Level inversion,
N
<2>
Clear
00H
01H 00H
<3>
215
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