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ZBasic System Library
8
ZX Microcontroller Family
USART3
Com8
64, J.1
63, J.0
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
5, C.7
6, 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-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
Com1
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.
SPI Interface
On some ZX devices, your program is stored in an external EEPROM that is read and written using the
SPI interface. A dedicated I/O pin is required for selecting the EEPROM device during SPI operations
and this I/O pin cannot be used for other purposes. However, the SPI bus itself can be used to
communicate with other SPI devices. Although most SPI devices are tolerant of the ZX device using the
SPI bus to fetch instructions from your program, a few are not. Generally speaking, if you can send and
receive all of the data that an SPI device requires using a single call to SPICmd(), then that SPI device is
usable with the ZX models that utilize an external EEPROM. The table below indicates which devices
use an external EEPROM for user programs and, if so, the I/O pin used for the chip select.
SPI EEPROM Usage and CS Pin By Controller Index
ZX Model
Uses SPI
EEPROM
Idx 0
CS Pin
Idx 1
CS Pin
Idx 2
CS Pin
Idx 3
CS Pin
ZX-24, ZX-24a, ZX-24p
Yes
B.4
ZX-40, ZX-40a, ZX-40p
Yes
5, B.4
ZX-44, ZX-44a, ZX-44p
Yes
44, B.4
ZX-24x
No
D.4
8, C.4
ZX-24n, ZX-24r, ZX-24s
No
B.4
ZX-40n, ZX-40r, ZX-40s
No
5, B.4
ZX-44n, ZX-44r, ZX-44s
No
44, B.4
ZX-328n, ZX-328l
No
16, B.2
ZX-32n, ZX-32l
No
14, B.2
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