UPD78F0138 NEC, UPD78F0138 Datasheet - Page 219

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

(2) Timing chart
8-bit timer counter Hn
<1> The count operation is enabled by setting the TMHEn bit to 1. Start 8-bit timer counter Hn by masking one
<2> When the values of 8-bit timer counter Hn and the CMP0n register match, the TOHn output level is inverted,
<3> When the values of 8-bit timer counter Hn and the CMP1n register match, the level of the TOHn output is
<4> Clearing the TMHEn bit to 0 during timer Hn operation makes the INTTMHn signal and TOHn output inactive.
The operation timing in PWM output mode is shown below.
Caution Make sure that the CMP1n register setting value (M) and CMP0n register setting value (N) are
Remark n = 0, 1
(TOLEVn = 0)
(TOLEVn = 1)
Count clock
count clock to count up. At this time, TOHn output remains inactive (when TOLEVn = 0).
the value of 8-bit timer counter Hn is cleared, and the INTTMHn signal is output.
returned. At this time, the 8-bit timer counter value is not cleared and the INTTMHn signal is not output.
Remark n = 0, 1
INTTMHn
TMHEn
CMP0n
CMP1n
TOHn
TOHn
within the following range.
00H ≤ CMP1n (M) < CMP0n (N) ≤ FFH
<1>
00H 01H
Figure 8-12. Operation Timing in PWM Output Mode (1/4)
CHAPTER 8 8-BIT TIMERS H0 AND H1
A5H 00H 01H 02H
User’s Manual U16228EJ2V0UD
<2>
(a) Basic operation
A5H
01H
<3>
A5H 00H
01H 02H
A5H 00H
<4>
219