MSM64P155 Datasheet, PDF (9/29 Pages) OKI electronic componets – 4-Bit Microcontroller with Built-in LCD Driver and Melody Circuit

¡ Semiconductor
MSM64P155/64P155L
Secondary Functions
Function Pin Symbol Type
Description
External
8
P2.0
I P2.0 to P2.3 secondary functions :
Interrupts
7
P2.1
6
P2.2
These are level-triggered external interrupt input pins.
Select interrupt enable/disable for each bit with the P2 interrupt
enable register (P2IE).
5
P2.3
If P2.0 to P2.3 pins are set to "H" level for a minimum of 2 seconds,
the device enters system reset mode.
P2.0, P2.1 secondary functions :
trigger input pins for capture circuit.
Event
Counter
Input
10
P3.0
18
P6.0
17
P6.1
16
P6.2
15
P6.3
22
P7.0
21
P7.1
20
P7.2
19
P7.3
9
P3.1
I P3.0 secondary function :
This is an input pin for external interrupt. This pin can receive an
interrupt at a rising edge, a falling edge, or at both rising and falling
edges.
I P6.0 to P6.3 secondary functions :
These are level-triggered external interrupt input pins.
I P7.0 to P7.3 secondary functions :
These are level-triggered external interrupt input pins.
I P3.1 secondary function :
Input port for event counter
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