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ZBasic System Library
167
ZX Microcontroller Family
Hardware USART Channel Assignment and I/O Pin Usage
ZX Model
USART
Serial Chan
Tx Pin
Rx Pin
ZX-24, ZX-24a
USART0
Com1¹
1, D.3
2, D.2
ZX-24p, ZX-24n, ZX-24r, ZX-24s
USART0
Com1¹
1, D.1
2, D.0
USART1
Com2
11, D.3
6, D.2
ZX-24x
USARTD0
Com1¹
1, D.3
2, D.2
USARTD1
Com2
D.7
D.6
USARTC0
Com7
9, C.3
10, C.2
USARTC1
Com8
13, C.7
14, C.6
USARTE0
Com9
19, E.3
18, E.2
ZX-32a4
USARTD0
Com1
23, D.3
22, D.2
USARTD1
Com2
27, D.7
26, D.6
USARTC0
Com7
13, C.3
12, C.2
USARTC1
Com8
17, C.7
16, C.6
USARTE0
Com9
33, E.3
32, E.2
ZX-128a1
USARTD0
Com1
28, D.3
27, D.2
USARTD1
Com2
32, D.7
31, D.6
USARTC0
Com7
18, C.3
17, C.2
USARTC1
Com8
22, C.7
21, C.6
USARTE0
Com9
38, E.3
37, E.2
USARTE1
Com10
42, E.7
41, E.6
USARTF0
Com11
48, F.3
47, F.2
USARTF1
Com12
52, F.7
51, F.6
ZX-40, ZX-40a
USART0
Com1
15, D.1
14, D.0
ZX-40p, ZX-40n, ZX-40r, ZX-40s
USART0
Com1
15, D.1
14, D.0
USART1
Com2
17, D.3
16, D.2
ZX-44, ZX-44a
USART0
Com1
10, D.1
9, D.0
ZX-44p, ZX-44n, ZX-44r, ZX-44s
USART0
Com1
10, D.1
9, D.0
USART1
Com2
12, D.3
11, D.2
ZX-328n, ZX-328l
USART0
Com1
3, D.1
2, D.0
ZX-32n, ZX-32l
USART0
Com1
31, D.1
30, D.0
ZX-1281
USART1
Com1
28, D.3
27, D.2
USART0
Com2
3, E.1
2, E.0
ZX-1280
USART0
Com1
3, E.1
2, E.0
USART1
Com2
46, D.3
45, D.2
USART2
Com7
13, H.1
12, H.0
USART3
Com8
64, J.1
63, J.0
ZX-24e, ZX-24ae
USART0
Com1¹
1, D.1
2, D.0
ZX-24ne, ZX-24pe
USART0
Com1¹
1, D.1
2, D.0
USART1
Com2
17, D.3
18, D.2
ZX-24nu, ZX-24pu, ZX-24ru, ZX-24su
USART0
Com1
1, D.1
2, D.0
USART1
Com2
17, D.3
18, D.2
ZX-24xu
USARTD0
Com1
1, D.3
2, D.2
USARTD1
Com2
13, D.7
14, D.6
USARTC0
Com7
9, C.3
10, C.2
USARTC1
Com8
5, C.7
6, C.6
USARTE0
Com9
21, E.3
22, E.2
ZX-328nu
USART0
Com1¹
19, D.1
20, D.0
ZX-128e, ZX-128ne, ZX-1281e, ZX-1281ne
USART0
Com1¹
19, E.1
20, E.0
USART1
Com2
9, D.3
10, D.2
¹For these devices, the Com1 signals are logically inverted.
It is important to note that on the ZX-24p, ZX-24n, ZX-24r and ZX-24s, the Com2 serial channel cannot
be used at the same time as the hardware I2C channel because the pin 11 is shared between the TxD
pin of Com2 and the SDA signal.
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