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LBn
LAn
0
0
0
1
1
0
1
1
CC interrupt pins are high-level active. Therefore signal high-level or rising-edge should be
chosen for external interrupt detection.
ERn
No external interrupt
0
1
ENn
0
1
3.2.2.2 Port function Register (PFR)
MB91F467D have altogether 14 external interrupt channels. User should choose three of
them for 16bit non-multiplexed mode.
The external interrupt function is assigned to MCU port22, port23 and port24. Each of them
has a 8bit port function register (PFR). The default value of register the PFR after reset is
zero, respectively all ports are general purpose input. To use the external interrupt function
only register PFR should be set to one.
Note:
All input pins are disabled by default. After pin configuration according
to its function it is necessary to enable the input pins globally:
PORTEN = 0x3;
MCU-AN-300016-E-V10
Interfacing MB91460 TO MB88121
Chapter 3 Software
Detect "L" level and generate an interrupt request
Detect "H" level and generate an interrupt request
Detect the rising-edge and generate an interrupt request
Detect the falling-edge and generate an interrupt request
Table 3-14 ELVR register
Read register
request present
External interrupt
request present
Table 3-15 EIRR register
External interrupt request is disabled
External interrupt request is enabled
Table 3-16 ENIR register
Description
Write register
Clear external interrupt request flag
No effect
Description
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