MSM63P238 查看數據表（PDF） - Oki Electric Industry

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MSM63P238

4-Bit Microcontroller with Built-in 16K Word PROM, POCSAG Decoder, and Melody Circuit

Oki Electric Industry 

¡ Semiconductor

MSM63P238

Table 2 Pin Descriptions (Secondary Functions) (continued)

Function

External

Memory

Symbol

P4.0/A0

P4.1/A1

P4.2/A2

P4.3/A3

P5.0/A4

P5.1/A5

P5.2/A6

P5.3/A7

P6.0/A8

P6.1/A9

P6.2/A10

P6.3/A11

P7.0/A12

P7.1/A13

P7.2/A14

P7.3/A15

P9.0/D0

P9.1/D1

P9.2/D2

P9.3/D3

PA.0/D4

PA.1/D5

PA.2/D6

PA.3/D7

P8.0/RD

P8.1/WR

Pin

Type

Description

73

Address output bus for external memory

74

75

76

77

78

79

80

O

2

3

4

5

6

7

8

9

65

Data bus for external memory

66

67

68

I/O

69

70

71

72

62

O Read signal output pin for external memory (negative logic)

64

O Write signal output pin for external memory (negative logic)

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