![](http://datasheet.mmic.net.cn/330000/MB90P234_datasheet_16438148/MB90P234_10.png)
MB90230 Series
10
(Continued)
Pin no.
Pin name
Circuit
type
I
Function
64
PA0
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Serial data input pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Serial data output pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Clock output pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Serial data input pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Serial data output pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
General-purpose I/O port
This port is always enabled.
The port serves as an open-drain output depending on the open-drain
setting register.
Clock output pin for the extended serial I/O interface
This pin functions when enabled by the control status register and by
the serial port switching register.
The pin is a general-purpose I/O port.
SIN1
65
PA1
H
SOT1
66
PA2
I
SCK1
67
PA3
I
SIN2
68
PA4
H
SOT2
69
PA5
I
SCK2