Rainbow Electronics W78C801 User Manual

Page 7

W78C801

Publication Release Date: February 1999

- 7 -

Revision A3

Interrupt Priority Register 1

Bit:

PX9

PX8

PX7

PX6

PX5

PX4

PX3

PX2

Mnemonic: IP1

Address: F8h

PX9: This bit defines the External interrupt 9 priority. PX9 = 1 sets it to higher priority level.
PX8: This bit defines the External interrupt 8 priority. PX8 = 1 sets it to higher priority level.
PX7: This bit defines the External interrupt 7 priority. PX7 = 1 sets it to higher priority level.
PX6: This bit defines the External interrupt 6 priority. PX6 = 1 sets it to higher priority level.
PX5: This bit defines the External interrupt 5 priority. PX5 = 1 sets it to higher priority level.
PX4: This bit defines the External interrupt 4 priority. PX4 = 1 sets it to higher priority level.
PX3: This bit defines the External interrupt 3 priority. PX3 = 1 sets it to higher priority level.
PX2: This bit defines the External interrupt 2 priority. PX2 = 1 sets it to higher priority level.

Interrupt Polarity Register

Bit:

IL9

IL8

IL7

IL6

IL5

IL4

IL3

IL2

Mnemonic: IX

Address: E9H

IL9: External interrupt 9 polarity level.
IL8: External interrupt 8 polarity level.
IL7: External interrupt 7 polarity level.
IL6: External interrupt 6 polarity level.
IL5: External interrupt 5 polarity level.
IL4: External interrupt 4 polarity level.
IL3: External interrupt 3 polarity level.
IL2: External interrupt 2 polarity level.

Note: 0 = active LOW, 1 = active HIGH.

Interrupt Request Flag Register

Bit:

IQ9

IQ8

IQ7

IQ6

IQ5

IQ4

IQ3

IQ2

Mnemonic: IRQ

Address: C0H

IQ9: External interrupt 9 request flag.
IQ8: External interrupt 8 request flag.
IQ7: External interrupt 7 request flag.
IQ6: External interrupt 6 request flag.
IQ5: External interrupt 5 request flag.
IQ4: External interrupt 4 request flag.
IQ3: External interrupt 3 request flag.
IQ2: External interrupt 2 request flag.