GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 12

• Manufacturer Part Number: GMS90
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: Hynix Semiconductor

PIN DEFINITIONS AND FUNCTIONS
8
P1.0-P1.7
P3.0-P3.7
Symbol
XTAL2
PLCC-
13-19
2-9
11,
11
13
14
15
16
17
18
19
20
44
2
3
2
Pin Number
10-17
PDIP-
1-8
10
11
12
13
14
15
16
17
18
40
1
2
1
5, 7-13
MQFP-
40-44,
1-3
40
41
40
10
11
12
13
14
44
5
7
8
9
Output
Input/
I/O
I/O
O
Port1
Port 1 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 1 pins that have 1s written to them are
pulled high by the internal pull-up resistors and can be
used as inputs. As inputs, port 1 pins that are
externally pulled low will source current because of
the pulls-ups (I
and P1.1 also. Port1 also receives the low-order
address byte during program memory verification.
Port1 also serves alternate functions of Timer 2.
P1.0 / T2 :
P1.1 / T2EX : Timer/counter 2 trigger input
In GMS9XC54/56/58:
P1.0 / T2, Clock Out : Timer/counter 2 external count
Port 3
Port 3 is an 8-bit bidirectional I/O port with internal
pull-ups. Port 3 pins that have 1s written to them are
pulled high by the internal pull-up resistors and can be
used as inputs. As inputs, port 3 pins that are
externally pulled low will source current because of
the pulls-ups (I
serves the special features of the 80C51 family, as
listed below.
P3.0 / RxD
P3.1 / TxD
P3.2 /INT0
P 3.3 / IN T 1
P3.4 /T0
P3.5 /T1
P3.6 / WR
P3.7 /RD
XTAL2
Output of the inverting oscillator amplifier.
receiver data input (asynchronous) or
data input output(synchronous) of serial
interface 0
transmitter data output (asynchronous)
or clock output (synchronous) of the
serial interface 0
interrupt 0 input/timer 0 gate control
interrupt 1 input/timer 1 gate control
counter 0 input
counter 1 input
the write control signal latches the data
byte from port 0 into the external data
memory
the read control signal enables the
external data memory to port 0
Timer/counter 2 external count input
input, Clock Out
IL
IL
, in the DC characteristics). Port 3 also
, in the DC characteristics). Pins P1.0
Function
Dec. 1998 Ver 3.0
GMS90 Series