Hyundai gms90x51c User Manual
HYUNDAI MicroElectronics
GMS90X5XC Series
6
Jan. 2001 Ver 1.0
PIN DEFINITIONS AND FUNCTIONS
Symbol
Pin Number
Input/
Output
Function
PLCC-
44
PDIP-
40
MQFP-
44
P1.0-P1.7
2-9
2
3
3
2
1-8
1
2
2
1
40-44,
1-3
40
41
41
40
I/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
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
IL
, in the DC characteristics). Pins P1.0
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 :Timer/counter 2 external count input
P1.1 / T2EX :Timer/counter 2 trigger input
address byte during program memory verification.
Port1 also serves alternate functions of Timer 2.
P1.0 / T2 :Timer/counter 2 external count input
P1.1 / T2EX :Timer/counter 2 trigger input
In GMS90X52C/54C:
P1.0 / T2, Clock Out : Timer/counter 2 external count
input, Clock Out
P1.0 / T2, Clock Out : Timer/counter 2 external count
input, Clock Out
P3.0-P3.7
11,
13-19
10-17
5, 7-13
I/O
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
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
IL
, in the DC characteristics). Port 3 also
serves the special features of the 80C51 family, as
listed below.
listed below.
11
13
14
15
16
17
18
15
16
17
18
19
10
11
12
13
14
15
16
13
14
15
16
17
5
7
8
9
9
10
11
12
11
12
13
P3.0 / RxD
P3.1 / TxD
P3.2 /INT0
P 3.3 / IN T 1
P3.4 /T0
P3.5 /T1
P3.6 / WR
P 3.3 / IN T 1
P3.4 /T0
P3.5 /T1
P3.6 / WR
P3.7 /RD
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
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
XTAL2
20
18
14
O
XTAL2
Output of the inverting oscillator amplifier.
Output of the inverting oscillator amplifier.