UPD17073 NEC, UPD17073 Datasheet - Page 87

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

Example Timer updating processing and BTM0CY flag detection time interval
The following is the timing chart of the above program.
BTIMER:
AAA:
BR
CE pin
BTM0CY flag
setting pulse
BTM0CY flag
BANK1
SKT1 BTM0CY
BR
BR
BTIMER
Timer updating
Processing A
H
L
H
L
1
0
AAA
BTIMER
SKT1
BTM0CY
BTM0CY detection
interval
; Executes timer updating processing if BTM0CY flag is “1”.
; Branches to AAA if BTM0CY flag is “0”.
t
CHECK
SKT1
BTM0CY
CE reset
Timer updating
processing
If this timer updating processing time is
too long, CE reset is effected while
processing is in progress.
t
TIMER
PD17072,17073
87