UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 220

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

(7) Operation of OVF0n flag
(8) One-shot pulse output
220
(a) Setting OVF0n flag (1)
(b) Clearing OVF0n flag
One-shot pulse output operates correctly in the free-running timer mode or the clear & start mode entered by the
TI00n pin valid edge. The one-shot pulse cannot be output in the clear & start mode entered upon a match
between TM0n and CR00n.
Remark n = 0 to 3
The OVF0n flag is set to 1 in the following case, as well as when TM0n overflows.
Select the clear & start mode entered upon a match between TM0n and CR00n.
Set CR00n to FFFFH.
When TM0n matches CR00n and TM0n is cleared from FFFFH to 0000H
Even if the OVF0n flag is cleared to 0 after TM0n overflows and before the next count clock is counted
(before the value of TM0n becomes 0001H), it is set to 1 again and clearing is invalid.
↓
↓
Count pulse
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
INTTM00n
OVF0n
CR00n
TM0n
Figure 7-57. Operation Timing of OVF0n Flag
FFFFH
FFFEH
User’s Manual U17554EJ4V0UD
FFFFH
0000H
0001H