mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 40

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

3
3.7 System Reset
3.7.1 SIM Reset Mode Selection
3-16
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.
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.
Mode Select Pin
MODCLK
DATA11
DATA0
DATA1
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
DATA8
DATA9
BKPT
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Table 3-6 SIM Reset Mode Selection
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Background Mode Disabled
VCO = System Clock
DSACK0, DSACK1,
Test Mode Disabled
IRQ[7:1], MODCLK
Default Function
CSBOOT 16-Bit
(Pin Left High)
AVEC, DS, AS,
OVERVIEW
CS[10:6]
SIZ[1:0]
CS[7:6]
CS[8:6]
CS[9:6]
CS0
CS1
CS2
CS3
CS4
CS5
CS6
Background Mode Enabled
EXTAL = System Clock
Alternate Function
Test Mode Enabled
(Pin Pulled Low)
CSBOOT 8-Bit
ADDR[20:19]
ADDR[21:19]
ADDR[22:19]
ADDR[23:19]
FC0FC1FC2
ADDR19
BGACK
PORTE
PORTF
BRBG
USER’S MANUAL
MC68331