UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 82

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

frequency is f
82
(2) Timing chart
If the setting value of the CMP01 register is N, the setting value of the CMP11 register is M, and the count clock
<4> When 8-bit timer counter H1 and the CMP11 register match, TOH1 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 TMHE1 = 0.
Cautions 1. In PWM output mode, the setting value for the CMP11 register can be changed during timer
The operation timing in PWM output mode is shown below.
Caution Make sure that the CMP11 register setting value (M) and CMP01 register setting value (N) are
compare register to be compared with 8-bit timer counter H1 is changed from the CMP11 register to the
CMP01 register.
generated.
CNT
within the following range.
00H
2. Be sure to set the CMP11 register when starting the timer count operation (TMHE1 = 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)
count operation. However, three operation clocks (signal selected using the CKS12 to
CKS10 bits of the TMHMD1 register) or more are required to transfer the register value after
rewriting the CMP11 register value.
the timer count operation was stopped (TMHE1 = 0) (be sure to set again even if setting the
same value to the CMP11 register).
CMP11 (M) < CMP01 (N)
At this time, 8-bit timer counter H1 is not cleared and the INTTMH1 signal is not
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 6 8-BIT TIMER H1
FFH
CNT