MAC7200 datasheet(87/976 Pages) FREESCALE

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Modes of Operation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

1.3

Modes of Operation

This section describes the various functional modes of the MAC72xx devices. A functional mode is

selected by asserting the MODA and MODB pins (PD1 and PD0, respectively) while the RESET pin is

asserted. Because there is no way to determine when these values are latched inside the device, the

MODA/MODB pins must be asserted the entire time that the RESET pin is asserted. External (weak)

pull-ups and/or pull-downs may be used for this purpose. Table 1-3 shows the values of the

MODA/MODB pins for each chip mode. Note that these encodings are only valid when the TEST pin is

negated (tied low).

Once a chip mode has been set, it may only be changed by any of the following:

•

Securing the flash, and resetting the device. In this case the mode changes from “XXX Unsecured

Mode” to “XXX Secured Mode”.

•

Unsecuring the flash, and resetting the device. In this case the mode changes from “XXX Secured

Mode” to “XXX Unsecured Mode”.

•

Changing the MODA/MODB pins and resetting the device. In this case the mode changes from

“XXX Secured/Unsecured Mode” to “YYY Secured/Unsecured Mode”.

Table 1-2. Typical System Access Summary

Port

Typical

(cycles)

Purpose

Comments

ARM7 Core

Flash

(Port M0=>S0)1

1. Port notations refer to Crossbar ports, and are explained in Chapter 15, “MAC7200

Crossbar Switch (AXBS)”.

RD: 1.2

(per instr.)

WR: N/A

Instruction Fetch

SRAM2

(Port M0=>S3)1

2. Assumes 0 programmed wait-states.

RD: 1

WR: 1

Operand

Read/Write

External Bus

(Port M0=>S1)1

RD: 2

WR: 2

Operand

Read/Write

Peripheral Bus Periphs

(Port M0=>S2)1

RD: 3

WR: 4

Peripheral

Config

DMA

Flash

(Port M1=>S0)1

RD: 3

WR: 4

Program Flash

SRAM2

(Port M1=>S3)1

RD: 1

WR: 1

Periph to/from

SRAM

External Bus

(Port M1=>S1)1

RD: 2

WR: 2

Periph to/from Ext.

Memory

Peripheral Bus Periphs

(Port M1=>S2)1

RD: 3

WR: 4

Periph to/from

SRAM

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