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FUNCTION DESCRIPTION
Port 4.1 GPIO
8051 P4.1 GPIO.
SDA2
P4.1
I/O, A
8
This pin also can be configured as the SDA signal of the 2
nd
I2C slave controller. In
this operation mode, this pin should also be configured as bi-directional I/O with open-
drain output.
8051 P4.0 GPIO
8051 P4.0 GPIO.
CEC
CEC Controller input/output pin.
P4.0
I/O
9
The falling edge can wake up this device from STOP mode.
Port 4.7 GPIO
P4.7
I/O
-
8051 P4.7 GPIO.
Port 3.4 GPIO
8051 P3.4 GPIO.
SS
P3.4
I/O
10
This pin also can be configured as selecting pin which can set the on-chip SPI
interface work under Master mode or Slave mode. To set the SPI interface of this
device work under Slave mode, the user can connect this pin to VSS, or to a CEB
output from other SPI master. To set the SPI interface of this device work under
Master mode, just tie this pin to VDD.
Port 4.3 GPIO
8051 P4.3 GPIO.
SCL2
P4.3
I/O
11
This pin also can be configured as the SCL signal of the 2
nd
I2C slave controller. This
pin should be configured as input only.
VSS
Power
12
Ground Voltage. 0V
RXVDD
Power
13
VDD for RTC
Supply voltage range: 1.0~2.75V.
RXIN
RXIN
I, A
14
Crystal IN for RTC oscillator.
RXOUT
RXOUT
O, A
15
Crystal OUT for RTC oscillator.
Port 4.2 GPIO
8051 P4.2 GPIO.
SWB3
P4.2
I/O, A
16
This pin also serves as one of the connection for analog switch B. The control of the
analog switch is done by setting of ANEN of IOCFGP4.2.
Port 4.4 GPIO
8051 P4.4 GPIO.
SWB2
P4.4
I/O, A
-
This pin also serves as one of the connection for analog switch B. The control of the
analog switch is done by setting of ANEN of IOCFGP4.4.
