![](http://datasheet.mmic.net.cn/330000/MB90P234_datasheet_16438148/MB90P234_7.png)
7
MB90230 Series
(Continued)
Pin no.
Pin name
Circuit
type
Function
22
P45
E
General-purpose I/O port
This port is enabled in the single-chip mode or when the upper
address control register setting is “port.”
A21
Output pin for external address A21
This pin is enabled in the external-bus enabled mode with the upper
address control register set to “address.”
PWM5
This pin serves as the output pin for 8-bit PWM5.
The pin is enabled for output by the control status register.
23
P46
L*
1
General-purpose I/O port
This port is enabled in the single-chip mode or when the upper
address control register setting is “port.”
A22
Output pin for external address A22
This pin is enabled in the external-bus enabled mode with the upper
address control register set to “address.”
TRG
This pin serves as the external trigger pin for the 8-bit PPG timer
The pin is enabled for triggering by the control status register.
24
P47
E
General-purpose I/O port
This port is enabled in the single-chip mode or when the upper
address control register setting is “port.”
A23
Output pin for external address A23
This pin is enabled in the external-bus enabled mode with the upper
address control register set to “address.”
PPG
This pin serves as the output pin for the 8-bit PPG timer.
The pin is enabled for output by the control status register.
25
P70
L*
1
General-purpose I/O port
ATG
External trigger input pin for the A/D converter
This pin functions when enabled by the control status register.
26
P71
F
General-purpose I/O port
EDI
Data input pin for the serial EEPROM interface
This pin functions when enabled by the control status register.
27
P72
E
General-purpose I/O port
EDO
Data output pin for the serial EEPROM interface
This pin functions when enabled by the control status register.
28
P73
E
General-purpose I/O port
ESK
Clock output pin for the serial EEPROM interface
This pin functions when enabled by the control status register.
29
P74
E
General-purpose I/O port
ECS
Chip select signal output pin for the serial EEPROM interface
This pin functions when enabled by the control status register.