 |
 |
|
 |
 |
ZBasic System Library
305
ZX Microcontroller Family
OutputCapture(), ShiftIn(), ShiftOut(), X10Cmd(), etc. will introduce more latency than simple instructions
like assigning a value to a variable.
Examples
Call WaitForInterrupt(zxPinChange)
Call WaitForInterrupt(zxPinRisingEdge, WaitInt2)
Call WaitForInterrupt(&H40, WaitPinChangeA) ' await a change on Port A, bit 6
Resource Usage
Only one task can be awaiting each interrupt at any particular time. If a task is already awaiting the
specified interrupt, another call to WaitForInterrupt() for that same interrupt will return immediately.
Also, on the ZX-24 the interrupt pins are common with I/O pins as shown in the table below. This means
that you should set the corresponding pin to be an input (either tri-state or pull-up) when you want to use
WaitForInterrupt(). Note, however, that if the pin is an output and a task is awaiting an interrupt, a
transition on the corresponding output can generate the interrupt for the waiting task. This may be of use
in special situations as a “software interrupt”.
Interrupt and I/O Pin Sharing for
ZX-24, ZX-24a, ZX-24p, ZX-24n, ZX-24r, ZX-24s
Interrupt
Port/Bit
Pin
0
Port C, Bit 6
6
1
Port C, Bit 1
11
2
Port A, Bit 2
18
Interrupt Input Pins (ATmega Devices)
ZX Models
INT0
INT1
INT2
INT3
INT4
INT5
INT6
INT7
AIN0
AIN1
ZX-24, ZX-24a, ZX-24p,
ZX-24n, ZX-24r, ZX-24s
6
11
18
-
-
-
-
-
18
-
ZX-40, ZX-40a, ZX-40p,
ZX-40n, ZX-40r, ZX-40s
16
17
3
-
-
-
-
-
3
4
ZX-44, ZX-44a, ZX-44p,
ZX-44n, ZX-44r, ZX-44s
11
12
42
-
-
-
-
-
42
43
ZX-24e, ZX-24ae, ZX-24ne,
ZX-24pe, ZX-24nu, ZX-24pu,
ZX-24ru, ZX-24su
18
17
26
-
-
-
-
-
26
25
ZX-328n, ZX-328l
4
5
-
-
-
-
-
-
12
13
ZX-32n, ZX-32l
32
1
-
-
-
-
-
-
10
11
ZX-1281, ZX-1281n
25
26
-
-
6
7
8
9
4
5
ZX-1280, ZX-1280n
43
44
45
46
6
7
8
9
4
5
ZX-128e, ZX-128ne,
ZX-1281e, ZX-1281ne
12
11
10
9
16
15
14
13
18
17
ZX-328nu
5
6
-
-
-
-
-
-
9
10
In the Interrupt Input Pin table above, the columns for INT2 and INT3 indicate that these interrupts are not
available for the ZX-1281. That is because the corresponding I/O pins are used for serial channel Com1.
For the ZX-1280, ZX-128e and ZX-1281e, INT2 and INT 3 will not be available if serial channel Com2 is
in use. Also, INT0 and INT1 are not available on mega128, mega1281and mega1280-based devices
when I2C channel 0 is in use since the same pins are used for the SCL and SDA signals.
For native code devices, the following table lists the ISRs that may be included in your program if it
invokes WaitForInterrupt(). The compiler will attempt to include only those ISRs that are required based
|
 |
|