upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 193

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

frequency is f
If the setting value of the CMP0n register is N, the setting value of the CMP1n register is M, and the count clock
<2> The count operation starts when TMHEn = 1.
<3> The CMP0n register is the compare register that is to be compared first after counter operation is enabled.
<4> When 8-bit timer counter Hn and the CMP1n register match, TOHn output becomes inactive and the
<5> By performing procedures <3> and <4> repeatedly, a pulse with an arbitrary duty can be obtained.
<6> To stop the count operation, set TMHEn = 0.
Cautions 1. In PWM output mode, three operation clocks (signal selected using the CKSn2 to CKSn0
Remark n = 0, 1
When the values of 8-bit timer counter Hn and the CMP0n register match, 8-bit timer counter Hn is cleared,
an interrupt request signal (INTTMHn) is generated, and TOHn output becomes active. At the same time,
the compare register to be compared with 8-bit timer counter Hn is changed from the CMP0n register to the
CMP1n register.
compare register to be compared with 8-bit timer counter Hn is changed from the CMP1n register to the
CMP0n register.
generated.
CNT
2. Be sure to set the CMP1n register when starting the timer count operation (TMHEn = 1) after
, the PWM pulse output cycle and duty are as follows.
PWM pulse output cycle = (N+1)/f
Duty = Active width : Total width of PWM = (M + 1) : (N + 1)
bits of the TMHMDn register) are required to transfer the CMP1n register value after
rewriting the register.
the timer count operation was stopped (TMHEn = 0) (be sure to set again even if setting the
same value to the CMP1n register).
At this time, 8-bit timer counter Hn is not cleared and the INTTMHn signal is not
CHAPTER 8 8-BIT TIMERS H0 AND H1
User’s Manual U16961EJ4V0UD
CNT
193