Hitachi SH7750 Hardware Manual page 813

Bit 15—NMI Input Level (NMIL): Sets the level of the signal input at the NMI pin. This bit can
be read to determine the NMI pin level. It cannot be modified.
Bit 15: NMIL
0
1
Bit 14—NMI Interrupt Mask (MAI): Specifies whether or not all interrupts are to be masked
while the NMI pin input level is low, irrespective of the CPU's SR.BL bit.
Bit 14: MAI
0
1
Note: * NMI interrupts are accepted in normal operation and in sleep mode.
In standby mode, all interrupts are masked, and standby is not cleared, while the NMI pin is
low.
Bit 9—NMI Block Mode (NMIB): Specifies whether an NMI request is to be held pending or
detected immediately while the SR.BL bit is set to 1.
Bit 9: NMIB
0
1
Notes: 1. If interrupt requests are enabled while SR.BL = 1, the previous exception information
will be lost, and so must be saved beforehand.
2. This bit is cleared automatically by NMI acceptance.
Bit 8—NMI Edge Select (NMIE): Specifies whether the falling or rising edge of the interrupt
request signal to the NMI pin is detected.
Bit 8: NMIE
0
1
Description
NMI pin input level is low
NMI pin input level is high
Description
Interrupts enabled even while NMI pin is low
Interrupts disabled while NMI pin is low*
Description
NMI interrupt requests held pending while SR.BL bit is set to 1
NMI interrupt requests detected while SR.BL bit is set to 1
Description
Interrupt request detected on falling edge of NMI input
Interrupt request detected on rising edge of NMI input
(Initial value)
(Initial value)
(Initial value)
Rev. 6.0, 07/02, page 763 of 986