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5.1.3
Pin Configuration
Table 5.1 lists the interrupt pins.
Table 5.1
Interrupt Pins
Name
Abbreviation I/O
Function
Nonmaskable interrupt
NMI
Input
Nonmaskable interrupt, rising edge or
falling edge selectable
External interrupt request 5 to 0
IRQ
5
to
IRQ
0
Input
Maskable interrupts, falling edge or level
sensing selectable
5.1.4
Register Configuration
Table 5.2 lists the registers of the interrupt controller.
Table 5.2
Interrupt Controller Registers
Address*
1
Name
Abbreviation
R/W
Initial Value
H'EE012
System control register
SYSCR
R/W
H'09
H'EE014
IRQ sense control register
ISCR
R/W
H'00
H'EE015
IRQ enable register
IER
R/W
H'00
H'EE016
IRQ status register
ISR
R/(W)*
2
H'00
H'EE018
Interrupt priority register A
IPRA
R/W
H'00
H'EE019
Interrupt priority register B
IPRB
R/W
H'00
Notes: 1. Lower 20 bits of the address in advanced mode.
2. Only 0 can be written, to clear flags.
5.2
Register Descriptions
5.2.1
System Control Register (SYSCR)
SYSCR is an 8-bit readable/writable register that controls software standby mode, selects the
action of the UI bit in CCR, selects the NMI edge, and enables or disables the on-chip RAM.
Only bits 3 and 2 are described here. For the other bits, see section 3.3, System Control Register
(SYSCR).
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