![](http://datasheet.mmic.net.cn/370000/UPD75236GJ_datasheet_16740772/UPD75236GJ_131.png)
131
μ
PD75236
5.
INTERRUPT FUNCTIONS
The
μ
PD75236 has eight types of interrupt sources and can generate multiple interrupts with priority order.
It is also equipped with two types of test sources. INT2 is an edge detected testable input.
Table 5-1 Interrupt Source Types
* 1.
Interrupt order is priority order to be applied when two or more interrupt requests are generated simul-
taneously.
These are test sources. They are affected by interrupt enable flags as in the case of interrupt sources, but
no vectored interrupt is generated.
2.
The
μ
PD75236 interrupt control circuit has the following functions:
(a)
Hardware-controller vectored interrupt function which can control interrupt acknowledge with the
interrupt enable flag (IEXXX) and the interrupt master enable flag (IME).
(b)
Function of setting any interrupt start address.
(c)
Multiple interrupt function which can specify priority order with the interrupt priority select
register (IPS).
(d)
Interrupt request flag (IRQXXX) test function. (Interrupt generation can be checked by software.)
(e)
Standby mode release function. (Interrupt to be released by interrupt enable flag can be selected.)
5.1
INTERRUPT CONTROL CIRCUIT CONFIGURATION
The interrupt control circuit has a configuration shown in Fig. 5-1 and each hardware is mapped in the data
memory space.
Vectored Interrupt Request
Signal (Vector Table Address)
VRQ1 (0002H)
VRQ2 (0004H)
VRQ3 (0006H)
VRQ4 (0008H)
VRQ5 (000AH)
VRQ6 (000CH)
VRQ7 (000EH)
Interrupt
Order
*1
1
2
3
4
5
6
7
Internal/
External
Internal
External
External
External
Internal
Internal
Internal
Internal
External
Internal
Interrupt Source
INTBT (Reference timer interval signal from the basic interval timer)
INT4 (Rising or falling edge detection)
INT0
INT1
INTCSI0 (Serial data transfer end signal)
INTT0 (Match signal from timer event/counter 0)
INTTPG (Match signal from timer/pulse generator)
INTKS (Key scan timing signal from display controller)
INT2
*2
(Rising edge detection)
INTW
*2
(Signal from watch timer)
(Rising and falling detected edge selection)
Testable input signal (IRQ2 and IRQW set)