C167CS datasheet(170/517 Pages) INFINEON

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C167CS

Derivatives

Parallel Ports

User’s Manual

7-43

V2.0, 2000-07

Alternate Functions of Port 6

A programmable number of chip select signals (CS4 … CS0) derived from the bus

control registers (BUSCON4 … BUSCON0) can be output on 5 pins of Port 6. The other

3 pins may be used for bus arbitration to accomodate additional masters in a C167CS

system.

The number of chip select signals is selected via bitfield CSSEL in register RP0H. During

an external reset register RP0H is configured according to the levels of PORT0.

Software can adjust the number of selected chip select signals via register RSTCON.

Table 7-8 summarizes the alternate functions of Port 6 depending on the number of

selected chip select lines (coded via bitfield CSSEL).

ODP6

P6 Open Drain Ctrl. Reg.

ESFR (F1CEH/E7H)

Reset Value: - - 00H

98765

43210

ODP6

2.1

ODP6

Bit

Function

ODP6.y

Port 6 Open Drain control register bit y

ODP6.y = 0: Port line P6.y output driver in push/pull mode

ODP6.y = 1: Port line P6.y output driver in open drain mode

Table 7-8

Alternate Functions of Port 6

Port 6 Pin Altern. Function

CSSEL = 10

Altern. Function

CSSEL = 01

Altern. Function

CSSEL = 00

Altern. Function

CSSEL = 11

P6.0

P6.1

P6.2

P6.3

P6.4

Gen. purpose IO

Chip select CS0

Chip select CS1

Gen. purpose IO

Chip select CS0

Chip select CS1

Chip select CS2

Gen. purpose IO

Chip select CS0

Chip select CS1

Chip select CS2

Chip select CS3

Chip select CS4

P6.5

P6.6

P6.7

HOLD

External hold request input

HLDA

Hold acknowledge output (master mode) or input (slave mode)

BREQ

Bus request output

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