Z8F6421PM020SC Datasheet, PDF (88/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
68
Table 25. Interrupt Request 1 Register (IRQ1)
BITS
FIELD
7
PAD7I
6
PAD6I
5
PAD5I
RESET
R/W
ADDR
4
PAD4I
3
PAD3I
0
R/W
FC3H
2
PAD2I
1
PAD1I
0
PAD0I
PADxI—Port A or Port D Pin x Interrupt Request
0 = No interrupt request is pending for GPIO Port A or Port D pin x.
1 = An interrupt request from GPIO Port A or Port D pin x is awaiting service.
where x indicates the specific GPIO Port pin number (0 through 7). For each pin, only 1 of
either Port A or Port D can be enabled for interrupts at any one time. Port selection (A or
D) is determined by the values in the Interrupt Port Select Register.
Interrupt Request 2 Register
The Interrupt Request 2 (IRQ2) register (Table 26) stores interrupt requests for both vec-
tored and polled interrupts. When a request is presented to the interrupt controller, the cor-
responding bit in the IRQ2 register becomes 1. If interrupts are globally enabled (vectored
interrupts), the interrupt controller passes an interrupt request to the eZ8 CPU. If interrupts
are globally disabled (polled interrupts), the eZ8 CPU can read the Interrupt Request 1
register to determine if any interrupt requests are pending.
Table 26. Interrupt Request 2 Register (IRQ2)
BITS
7
FIELD ^T3I
6
U1RXI
5
U1TXI
RESET
R/W
ADDR
4
DMAI
3
PC3I
0
R/W
FC6H
2
PC2I
1
PC1I
0
PC0I
T3I—Timer 3 Interrupt Request
0 = No interrupt request is pending for Timer 3.
1 = An interrupt request from Timer 3 is awaiting service.
PS019915-1005
Interrupt Controller