HMS87C5216 Datasheet, PDF (52/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

HMS87C5216
7
IMOD
-
Interrupt Mode Register
0
-
IM1
IM0
IP3
IP2
IP1
IP0
R/W <00CA h>
Assigning by interrupt accept mode bit
IM1
IM0
Priority
0
0
fixed by hardware
0
1
changeable by IP3~ IP0
1
*
Interrupt is inhibited
(1) Selection of Interrupt by IP3-IP0
The condition allow for accepting interrupt is set state of the in-
terrupt mask enable flag and
the interrupt enable bit must be ``1``. In Reset state, these IP3 -
IP0 registers become all ``0``.
IP3
0
0
0
0
0
0
0
1
1
1
1
1
(2) Interrupt Timing
IP2
IP1
IP0
Selection Interrupt
0
0
1
KSCNR (Key Scan)
0
1
0
INT1R (External interrupt 1)
0
1
1
INT2R (External interrupt 2)
1
0
0
Reserved
1
0
1
T0R (Timer 0)
1
1
0
T1R (Timer 1)
1
1
1
T2R (Timer 2)
0
0
0
Reserved
0
0
1
Reserved
0
1
0
WDTR (Watch Dog Timer)
0
1
1
BITR (Basic Interval Timer)
1
0
0
Reserved
Table 13-1 Interrupt Selection by IP3 - IP0
CLOCK
SYNC
A command before interrupt
Interrupt Request Sampling
Figure 13-2 Interrupt Enable Accept Timing
interrupt process step
*Interrupt Request sampling time
SEP. 2004 Ver 1.01