DSP56854 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56854

16-bit Digital Signal Controllers

Freescale Semiconductor 

Introduction

Table 3-1. 56854 Signal and Package Information for the 128-pin LQFP (Continued)

Pin No.

Signal Name

Type

Description

73

D0

Input/Output(Z) Data Bus (D0-D15)—These pins provide the bidirectional data for

external program or data memory accesses.

86

D1

87

D2

88

D3

89

D4

90

D5

107

D6

108

D7

109

D8

110

D9

111

D10

122

D11

123

D12

126

D13

127

D14

128

D15

7

RD

Output

Read Enable (RD) —is asserted during external memory read

cycles.

This signal is pulled high during reset.

8

WR

Output

Write Enable (WR)— is asserted during external memory write

cycles.

This signal is pulled high during reset.

75

CS0

Output

External Chip Select (CS0)—This pin is used as a dedicated GPIO.

GPIOA0

Input/Output

Port A GPIO (0) —This pin is a General Purpose I/O (GPIO) pin

when not configured for host port usage.

76

CS1

Output

External Chip Select (CS1)—This pin is used as a dedicated GPIO.

GPIOA1

Input/Output

Port A GPIO (1) —This pin is a General Purpose I/O (GPIO) pin

when not configured for host port usage.

56854 Technical Data, Rev. 6

Freescale Semiconductor

13

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