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¡ Semiconductor

MSM65355

PIN DESCRIPTIONS

Basic Function

Digital power supply (5V)

Digital ground

79

–

Description

Function

Pin

Type

Power

68

–

Oscillator input pin: connects to a crystal oscillator (or ceramic

resonator) or external clock.

Oscillator

78

I

Oscillator output pin: connects to a crystal oscillator (or ceramic

resonator). When an external clock is input to OSC0, leave OSC1

open.

77

O

XT-side oscillator input pin: connects a crystal oscillator of

32.768kHz or 75kHz.

80

I

XT-side oscillator output pin: connects a crystal oscillator of

32.768kHz or 75kHz.

81

O

Analog power supply (5V)

Analog ground

21

–

31

–

Analog reference voltage

LCD drive bias output

96

–

30

–

LCD drive bias output

LCD drive bias output

98

–

97

–

Capacitor connecting pins for LCD drive bias generation

100

–

99

–

Ports

67

to

60

I/O 8-bit input-output port (port 1): input or output can be selected for

each bit by the port 1 direction register (P1DIR). In addition to their

input or output port functions, the pins of port 1 have secondary

functions: see Secondary Function.

Control

87

I

System reset input: when this pin goes low, the internal state of

the chip is initialized and program execution restarts from address

resistor.

76

to

69

I/O 8-bit input-output port (port 0): input or output can be selected for

each bit by the port 0 direction register (P0DIR). In addition to their

input-output port functions, the pins of port 0 have secondary

functions: see Secondary Function.

86

to

82

I/O 5-bit input-output port (port 2): input or output can be selected for

each bit by the port 2 direction register (P2DIR). In addition to their

input or output port functions, P2.0 and P2.1 have secondary

functions: see Secondary Function.

22

to

29

I

8-bit input port (port3): during A/D conversion, the pins of port 3

function as analog input channels.

51

to

44

I/O 8-bit input-output port (port 4).

43

to

36

I/O 8-bit input-output port (port 5): input or output can be selected for

each bit by the port 5 direction register (P5DIR).

GND

Symbol

OSC0

OSC1

XT

XT

AGND

C2

C1

P1.0

to

P1.7

RESET

P0.0

to

P0.7

P2.0

to

P2.4

P3.0

to

P3.7

P4.0

to

P4.7

P5.0

to

P5.7