GMS81C7216 Datasheet, PDF (10/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
5. PIN FUNCTION
V_DD: Supply voltage.
V_SS: Circuit ground.
RESET: Reset the MCU.
AV_DD: Supply voltage to the ladder resistor of ADC circuit. To
enhance the resolution of analog to digital converter, use inde-
pendent power source as well as possible, other than digital pow-
er source.
AV_SS: ADC circuit ground.
X_IN: Input to the inverting oscillator amplifier and input to the in-
ternal main clock operating circuit.
X_OUT: Output from the inverting oscillator amplifier.
BIAS: LCD bias voltage input pin.
VCL0~VCL2: LCD driver power supply pins. The voltage on
each pin is VCL2> VCL1> VCL0. For details, Refer to “18. LCD
DRIVER” on page 65.
COM0~COM3: LCD common signal output pins. Also, the pins
of COM1,COM2 and COM3 are shared with LCD segment sig-
nal outputs of SEG26, SEG25, SEG24 as application require-
ment.
R00~R07: R0 is an 8-bit CMOS bidirectional I/O port. R0 pins 1
or 0 written to the Port Direction Register can be used as outputs
or schmitt trigger inputs. Also, pull-up resistors and open-drain
outputs are software assignable.
In addition, R0 serves the functions of the various following spe-
cial features.
Port Pin
R00
R01
R02
R03
R04
R05
R06
R07
Alternate Function
INT0 (External Interrupt 0)
INT1 (External Interrupt 1)
INT2 (External Interrupt 2)
EC0 (Event Counter Input 0)
EC2 (Event Counter Input 2)
SCK (Serial Clock)
SO (Serial Data Output)
SI (Serial Data Input)
R21~R23: R2 is an 3-bit CMOS bidirectional I/O port. R2 pins 1
or 0 written to the Port Direction Register can be used as outputs
or inputs. Also, pull-up resistors and open-drain outputs are soft-
ware assignable.
In addition, R2 is shared with the ADC input.
Port Pin
R21
R22
R23
Alternate Function
AN1 (Analog Input 1)
AN2 (Analog Input 2)
AN3 (Analog Input 3)
R30: R3 is a 1-bit CMOS bidirectional I/O port. R30 pin 1 or 0
written to the Port Direction Register can be used as output or in-
put. Also, pull-up resistor and open-drain output is software as-
signable.
In addition, R30 serves the function of the following spe-
cial feature.
Port Pin
R30
Alternate Function
BUZ (Buzzer driving output)
SEG0~SEG7: These pins generate LCD segment signal output.
Every LCD segment pins are shared with normal R4 input/output
port. R4 is an 8-bit CMOS bidirectional I/O port. R4 pins 1 or 0
written to the Port Direction Register can be used as outputs or in-
puts.
LCD Pin Function
SEG0 (LCD Segment 0 Signal Output)
SEG1 (LCD Segment 1 Signal Output)
SEG2 (LCD Segment 2 Signal Output)
SEG3 (LCD Segment 3 Signal Output)
SEG4 (LCD Segment 4 Signal Output)
SEG5 (LCD Segment 5 Signal Output)
SEG6 (LCD Segment 6 Signal Output)
SEG7 (LCD Segment 7 Signal Output)
Port Pin
R40
R41
R42
R43
R44
R45
R46
R47
SEG8~SEG11: These pins generate LCD segment signal output.
Every LCD segment pins are shared with normal R5 input/output
port. R5 is an 4-bit CMOS bidirectional I/O port. R5 pins 1 or 0
written to the Port Direction Register can be used as outputs or in-
puts.
LCD Pin Function
SEG8 (LCD Segment 8 Signal Output)
SEG9 (LCD Segment 9 Signal Output)
SEG10 (LCD Segment 10 Signal Output)
SEG11 (LCD Segment 11 Signal Output)
Port Pin
R50
R51
R52
R53
SEG16~SEG20: These pins generate LCD segment signal out-
put.
Every LCD segment pins are shared with normal R6 input/output
port. R6 is an 5-bit CMOS bidirectional I/O port. R6 pins 1 or 0
written to the Port Direction Register can be used as outputs or in-
puts.
LCD Pin Function
SEG16 (LCD Segment 16 Signal Output)
SEG17 (LCD Segment 17 Signal Output)
SEG18 (LCD Segment 18 Signal Output)
SEG19 (LCD Segment 19 Signal Output)
SEG20 (LCD Segment 20 Signal Output)
Port Pin
R60
R61
R62
R63
R64
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FEB. 2005 Ver 1.04