Z8F6421PM020SC Datasheet, PDF (89/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
69
U1RXI—UART 1 Receive Interrupt Request
0 = No interrupt request is pending for the UART1 receiver.
1 = An interrupt request from UART1 receiver is awaiting service.
U1TXI—UART 1 Transmit Interrupt Request
0 = No interrupt request is pending for the UART 1 transmitter.
1 = An interrupt request from the UART 1 transmitter is awaiting service.
DMAI—DMA Interrupt Request
0 = No interrupt request is pending for the DMA.
1 = An interrupt request from the DMA is awaiting service.
PCxI—Port C Pin x Interrupt Request
0 = No interrupt request is pending for GPIO Port C pin x.
1 = An interrupt request from GPIO Port C pin x is awaiting service.
where x indicates the specific GPIO Port C pin number (0 through 3).
IRQ0 Enable High and Low Bit Registers
The IRQ0 Enable High and Low Bit registers (Tables 28 and 29) form a priority encoded
enabling for interrupts in the Interrupt Request 0 register. Priority is generated by setting
bits in each register. Table 27 describes the priority control for IRQ0.
Table 27. IRQ0 Enable and Priority Encoding
IRQ0ENH[x] IRQ0ENL[x] Priority
Description
0
0
Disabled
Disabled
0
1
Level 1
Low
1
0
Level 2
Nominal
1
1
Level 3
High
where x indicates the register bits from 0 through 7.
Table 28. IRQ0 Enable High Bit Register (IRQ0ENH)
BITS
FIELD
7
T2ENH
RESET
R/W
ADDR
6
T1ENH
5
T0ENH
4
3
U0RENH U0TENH
0
R/W
FC1H
2
I2CENH
1
0
SPIENH ADCENH
PS019915-1005
Interrupt Controller