UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 146

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

146
8-bit timer counter H1
<1> The count operation is enabled by setting TMHE1 = 1. Start 8-bit timer counter H1 by masking one count
<2> The CMP11 register value can be changed during timer counter operation. This operation is asynchronous
<3> When the values of 8-bit timer counter H1 and the CMP01 register match, the value of 8-bit timer counter H1
<4> If the CMP11 register value is changed, the value is latched and not transferred to the register. When the
<5> When the values of 8-bit timer counter H1 and the CMP11 register after the change match, the TOH1 output
<6> Clearing the TMHE1 bit to 0 during timer H1 operation makes the INTTMH1 signal and TOH1 output inactive.
(TOLEV1 = 0)
Count clock
clock to count up. At this time, the TOH1 output remains inactive (when TOLEV1 = 0).
to the count clock.
is cleared, the TOH1 output becomes active, and the INTTMH1 signal is output.
values of 8-bit timer counter H1 and the CMP11 register before the change match, the value is transferred to
the CMP11 register and the CMP11 register value is changed (<2>’).
However, three count clocks or more are required from when the CMP11 register value is changed to when
the value is transferred to the register. If a match signal is generated within three count clocks, the changed
value cannot be transferred to the register.
becomes inactive. 8-bit timer counter H1 is not cleared and the INTTMH1 signal is not generated.
INTTMH1
TMHE1
CMP01
CMP11
TOH1
(e) Operation by changing CMP11 (CMP11 = 02H → 03H, CMP01 = A5H)
00H 01H 02H
<1>
Figure 8-9. Operation Timing in PWM Output Mode (4/4)
02H
<2>
80H
CHAPTER 8 8-BIT TIMER H1
A5H 00H 01H 02H 03H
User’s Manual U16898EJ5V0UD
<3>
02H (03H)
<4>
<2>'
A5H
03H
A5H 00H 01H 02H 03H
<5>
A5H 00H
<6>