Cypress CY7C67300 manual D11/MOSI, Mosi SPI Mosi, Sck Spi Sck, D8/MISO, Miso SPI Miso, GPIO31/SCK

Models: CY7C67300

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CY7C67300

Table 131. Pin Descriptions (continued)

 

 

 

 

 

 

 

 

 

Pin

Name

 

Type

Description

 

71

D11/MOSI

 

IO

D11: External Memory Data Bus

 

 

 

 

 

MOSI: SPI MOSI

 

72

D10/SCK

 

IO

D10: External Memory Data Bus

 

 

 

 

 

SCK: SPI SCK

 

73

D9/nSSI

 

IO

D9: External Memory Data Bus

 

 

 

 

 

nSSI: SPI nSSI

 

74

D8/MISO

 

IO

D8: External Memory Data Bus

 

 

 

 

 

MISO: SPI MISO

 

76

D7

 

IO

External Memory Data Bus

 

77

D6

 

IO

 

 

78

D5

 

IO

 

 

79

D4

 

IO

 

 

80

D3

 

IO

 

 

81

D2

 

IO

 

 

82

D1

 

IO

 

 

83

D0

 

IO

 

 

33

A14

 

Output

External Memory Address Bus

 

32

A13

 

Output

 

 

31

A12

 

Output

 

 

30

A11

 

Output

 

 

27

A10

 

Output

 

 

25

A9

 

Output

 

 

24

A8

 

Output

 

 

20

A7

 

Output

 

 

17

A6

 

Output

 

 

8

A5

 

Output

 

 

7

A4

 

Output

 

 

3

A3

 

Output

 

 

2

A2

 

Output

 

 

1

A1

 

Output

 

 

99

nBEL/A0

 

Output

nBEL: Low Byte Enable for 16-bit memories

 

 

 

 

 

A0: External Memory Address bit A0 for 0-8 bit memories

 

98

nBEH

 

Output

High Byte Enable for 16-bit memories

 

64

nWR

 

Output

External Memory Write pulse

 

62

nRD

 

Output

External Memory Read pulse

 

97

A16

 

Output

A16: External SRAM A16

 

96

A17

 

Output

A17: External SRAM A17

 

95

A18

 

Output

A18: External SRAM A18

 

34

nXMEMSEL

 

Output

External Memory Select 0

 

35

nXROMSEL

 

Output

External Memory Select 1

 

36

nXRAMSEL

 

Output

External Memory Select 2

 

38

A15/CLKSEL

 

IO

A15: External SRAM A15

 

 

 

 

 

CLKSEL: Sampled directly after reset to determine what crystal or

 

 

 

 

 

clock source frequency is being used. 12 MHz is required for normal

 

 

 

 

 

operation so the CLKSEL pin must have a 47K ohm pull up to VCC.

 

 

 

 

 

After reset this pin functions as A15.

 

39

GPIO31/SCK

 

IO

GPIO31: General Purpose IO

 

 

 

 

 

SCK: I2C EEPROM SCK

 

40

GPIO30/SDA

 

IO

GPIO30: General Purpose IO

 

 

 

 

 

SDA: I2C EEPROM SDA

 

Document #: 38-08015 Rev. *J

 

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Cypress CY7C67300 D11/MOSI, Mosi SPI Mosi, Sck Spi Sck, D8/MISO, Miso SPI Miso, GPIO31/SCK, SCK I2C Eeprom SCK GPIO30/SDA