UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 131

8BIT MCU, 4K FLASH, 256B RAM, 78F9222

UPD78F9222MC(T)-5A4-A

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

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

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7.5
(1) Error when timer starts
(2) Setting of 8-bit compare register 80
(3) Note on setting STOP mode
Notes on 8-bit Timer 80
The time from starting the timer to generation of the match signal includes an error of up to 1.5 clocks. This is
because, if the timer is started while the count clock is high, the rising edge may be immediately detected and
the counter may be incremented (refer to Figure 7-6).
8-bit compare register 80 (CR80) can be set to 00H.
Before executing the STOP instruction, be sure to stop the timer operation (TCE80 = 0).
TM80 count value
Selected clock
Selected clock
Clear signal
Count pulse
TCE80
TCE80
Figure 7-6. Case Where Error of 1.5 Clocks (Max.) Occurs
00H
CHAPTER 7 8-BIT TIMER 80
User’s Manual U16898EJ5V0UD
Delay A
Delay B
If the timer is started when the selected clock is high
and if delay A > delay B, an error of up to 1.5 clocks occurs.
Count pulse
01H
Delay A
Delay B
02H
8-bit timer counter 80
(TM80)
03H
Clear signal
...
131

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