SPAKMC331MFC20 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

SPAKMC331MFC20

highly-integrated 32-bit microcontroller, 16MHz

Motorola => Freescale 

3.7 System Reset

The following information is a concise reference only. System reset is a complex op-

eration. To understand operation during and after reset, refer to SECTION 4 SYSTEM

INTEGRATION MODULE, paragraph 4.6 Reset for a more complete discussion of the

reset function.

3.7.1 SIM Reset Mode Selection

The logic states of certain data bus pins during reset determine SIM operating config-

uration. In addition, the state of the MODCLK pin determines system clock source and

the state of the BKPT pin determines what happens during subsequent breakpoint as-

sertions. Table 3-6 is a summary of reset mode selection options.

3

Table 3-6 SIM Reset Mode Selection

Mode Select Pin

DATA0

DATA1

DATA2

DATA3

DATA4

DATA5

DATA6

DATA7

DATA8

DATA9

DATA11

MODCLK

BKPT

Default Function

(Pin Left High)

CSBOOT 16-Bit

CS0

CS1

CS2

CS3

CS4

CS5

CS6

CS[7:6]

CS[8:6]

CS[9:6]

CS[10:6]

DSACK0, DSACK1,

AVEC, DS, AS,

SIZ[1:0]

IRQ[7:1], MODCLK

Test Mode Disabled

VCO = System Clock

Background Mode Disabled

Alternate Function

(Pin Pulled Low)

CSBOOT 8-Bit

BRBG

BGACK

FC0FC1FC2

ADDR19

ADDR[20:19]

ADDR[21:19]

ADDR[22:19]

ADDR[23:19]

PORTE

PORTF

Test Mode Enabled

EXTAL = System Clock

Background Mode Enabled

MOTOROLA

3-16

OVERVIEW

MC68331

USER’S MANUAL

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