SPMCK16Z4MPV20 datasheet(393/500 Pages) FREESCALE

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M68HC16 Z SERIES

USER’S MANUAL

D-19

CSORBT and CSOR[0:10] contain parameters that support operations from external

memory devices. Bit and field definitions for CSORBT and CSOR[0:10] are the same.

MODE — Asynchronous/Synchronous Mode

0 = Asynchronous mode is selected.

1 = Synchronous mode is selected, and used with ECLK peripherals.

In asynchronous mode, chip-select assertion is synchronized with AS and DS.

In synchronous mode, the chip-select signal is asserted with ECLK.

BYTE[1:0] — Upper/Lower Byte Option

This field is used only when the chip-select 16-bit port option is selected in the pin as-

signment register. This allows the usage of two external 8-bit memory devices to be

concatenated to form a 16-bit memory. Table D-13 shows upper/lower byte options.

R/W[1:0]— Read/Write

This field causes a chip-select to be asserted only for a read, only for a write, or for

both read and write. Table D-14 shows the options.

STRB — Address Strobe/Data Strobe

This bit controls the timing for assertion of a chip-select in asynchronous mode only.

Selecting address strobe causes the chip-select to be asserted synchronized with ad-

dress strobe. Selecting data strobe causes the chip-select to be asserted synchro-

nized with data strobe. Data strobe timing is used to create a write strobe when

needed.

0 = Address strobe

1 = Data strobe

DSACK[3:0] — Data Strobe Acknowledge

This field specifies the source of DSACK in asynchronous mode as internally generat-

ed or externally supplied. It also allows the user to adjust bus timing with internal

DSACK generation by controlling the number of wait states that are inserted to opti-

mize bus speed in a particular application. Table D-15 shows the DSACK[3:0] field en-

coding. The fast termination encoding (%1110) effectively corresponds to –1 wait

states.

Table D-13 BYTE Field Bit Encoding

BYTE[1:0]

Description

Disable

Lower byte

Upper byte

Both bytes

Table D-14 Read/Write Field Bit Encoding

R/W[1:0]

Description

Disable

Read only

Write only

Read/Write

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