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ZBasic System Library
302
ZX Microcontroller Family
&H22
WaitPinChangeC
Pin change on Port C
Pin change on Port C¹
&H23
WaitPinChangeD
Pin change on Port D
Pin change on Port D²
1
Bits 0-5 only.
²Bits 2-7 only.
intNum Values for Pin Change Interrupts
Value
Built-in Constant
Trigger – mega1281
Trigger – mega1280
&H20
WaitPinChangeA
&H21
WaitPinChangeB
Pin change on Port B
Pin change on Port B
&H22
WaitPinChangeC
&H23
WaitPinChangeD
&H24
WaitPinChangeE
Change on Port Bit E.0¹
&H29
WaitPinChangeJ
Pin change on Port J²
&H2a
WaitPinChangeK
Pin change on Port K
¹Not available on the ZX-1281e.
²Bits 0-6 only.
For each of the intNum values in the tables above, the mode parameter specifies pin change interrupt
enable bits corresponding to each pin of the port. For example, if the mode value is &H21, a pin change
interrupt will be generated if either bit 0 or bit 5 of the specified port changes state. Clearly, a mode value
of zero is useless since no pin change interrupt can ever occur in that case.
Pin Change Interrupts (ATxmega-based devices)
For ZX models based on the ATxmega processors, a task may await a state change on one or more pins
of an I/O port. Each port has two separate channels of pin-change detection, e.g. WaitPinChangeA0
and WaitPinChangeA1. The channel is specified using values intNum parameter shown in the table
below.
intNum Values for Pin Change Interrupts
Value
Built-in Constant
Trigger
Processors
&H20
WaitPinChangeA0
Pin change on Port A, channel 0
xmega128A1, xmega32A4
&H21
WaitPinChangeA1
Pin change on Port A, channel 1
xmega128A1, xmega32A4
&H22
WaitPinChangeB0
Pin change on Port B, channel 0
xmega128A1, xmega32A4
&H23
WaitPinChangeB1
Pin change on Port B, channel 1
xmega128A1, xmega32A4
&H24
WaitPinChangeC0
Pin change on Port C, channel 0
xmega128A1, xmega32A4
&H25
WaitPinChangeC1
Pin change on Port C, channel 1
xmega128A1, xmega32A4
&H26
WaitPinChangeD0
Pin change on Port D, channel 0
xmega128A1, xmega32A4
&H27
WaitPinChangeD1
Pin change on Port D, channel 1
xmega128A1, xmega32A4
&H28
WaitPinChangeE0
Pin change on Port E, channel 0
xmega128A1, xmega32A4
&H29
WaitPinChangeE1
Pin change on Port E, channel 1
xmega128A1, xmega32A4
&H2a
WaitPinChangeF0
Pin change on Port F, channel 0
xmega128A1
&H2b
WaitPinChangeF1
Pin change on Port F, channel 1
xmega128A1
&H2c
WaitPinChangeH0
Pin change on Port H, channel 0
xmega128A1
&H2d
WaitPinChangeH1
Pin change on Port H, channel 1
xmega128A1
&H2e
WaitPinChangeJ0
Pin change on Port J, channel 0
xmega128A1
&H2f
WaitPinChangeJ1
Pin change on Port J, channel 1
xmega128A1
&H30
WaitPinChangeK0
Pin change on Port K, channel 0
xmega128A1
&H31
WaitPinChangeK1
Pin change on Port K, channel 1
xmega128A1
&H32
WaitPinChangeQ0
Pin change on Port Q, channel 0
xmega128A1
&H33
WaitPinChangeQ1
Pin change on Port Q, channel 1
xmega128A1
For each of the intNum values in the tables above, the mode parameter specifies pin change interrupt
enable bits corresponding to each pin of the port. For example, if the mode value is &H21, a pin change
interrupt will be generated if either bit 0 or bit 5 of the specified port changes state. Clearly, a mode value
of zero is useless since no pin change interrupt can ever occur in that case.
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