FM8P51
Rev1.2 Mar 15, 2005
P.4/FM8P51
FEELING
TECHNOLOGY
PIN DESCRIPTIONS
Name
I/O
Description
IOA0 ~ IOA7
I/O
Bi-direction I/O port
Software controlled pull-high for all pins
IOB0 ~ IOB7
I/O
Bi-direction I/O port with system wake-up function
Software controlled pull-high for all pins
IOC0 ~ IOC2
I/O Bi-direction I/O pins with driving ability selection
IOC3
I/O Bi-direction I/O pin
CLK
I/O
By connecting IOC4 and IOC6 together
IOC4 is a bi-direction I/O pin with system wake-up and software controlled pull-high function
IOC6 is a bi-direction I/O pin with software controlled open-drain output
Note : Both IOC4 and IOC6 should not be defined as output pins at the same time.
DATA
I/O
By connecting IOC5 and IOC7 together
IOC5 is a bi-direction I/O pin with system wake-up and software controlled pull-high function
IOC7 is a bi-direction I/O pin with software controlled open-drain output
Note : Both IOC5 and IOC7 should not be defined as output pins at the same time.
IOD0 ~ IOD7
I/O
Bi-direction I/O port
Software controlled pull-high for all pins
IOD0 and IOD1 are R-option pins
IOE0 ~ IOE1
I/O
Bi-direction I/O pins with system wake-up function
Software controlled pull-high for all pins
IOE2 ~ IOE5
I/O
Bi-direction I/O pins
All pins can be pulled-high by software
IOE6 ~ IOE7
I/O Bi-direction I/O pins
INT
I
External interrupt input triggered by falling edge
SDI
I
Serial data in for SPI
SDO
O Serial data out for SPI
SCK
I/O Serial clock for SPI
SSB
I
Slave select (active low) for SPI
PWM0 ~ PWM1 O PWM output pins
RFC0 ~ RFC18 O The RC oscillator network output of RFC module
CX
I
The RC oscillator network input of RFC module
OSCI
I
X’tal type: Oscillator crystal input
RC type: Clock input of RC oscillator
OSCO
O
X’tal type: Oscillator crystal output.
RC mode: Outputs with 1/4 the frequency of OSCI to denotes the instruction cycle rate
CKOUT
O Oscillator frequency output with high driving ability and output phase selection
RSTB
I
System clear (RESET) input. This pin is an active low RESET to the device. Internal weak
pull-high.
Vdd
-
Positive supply
Vss
-
Ground
Legend: I=input, O=output, I/O=input/output