UPD75518 NEC, UPD75518 Datasheet - Page 63

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

SET1
4.4 BASIC INTERVAL TIMER
(1) Configuration of the basic interval timer
(2) Basic interval timer functions
From the clock
generator
Note Instruction execution
f
f
f
f
X
X
X
X
Note
Fig. 4-20 shows the configuration of the basic interval timer.
The basic interval timer provides the following functions:
(a) Interval timer operation that generates a reference time interrupt
(b) Application of watchdog timer for detecting program crashes
(c) Selection of a wait time for releasing the standby mode, and counting
(d) Reading the count value
/2
/2
/2
/2
BTM3
5
7
9
12
BTM2
4
BTM1
MPX
3
Fig. 4-20 Configuration of the Basic Interval Timer
BTM0
BTM
(8-bit frequency divider circuit)
Internal bus
Basic interval timer
8
Clear signal
BT
Wait release
signal for standby
release
Set
signal
BT interrupt
request flag
PD75518(A)
IRQBT
Clear signal
Vectored
interrupt
request
signal
63