MC68HC908GR8A_07 Datasheet, PDF(224/260 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC908GR8A_07 Datasheet, PDF (224/260 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Development Support

Table 18-1. Monitor Mode Signal Requirements and Options

Mode

IRQ

RST

Reset

Vector

Serial

Communi-

cation

Mode

Selection

PLL

PTA0 PTA1 PTB0 PTB1

COP

Communication

Speed

External

Bus

Baud

Clock Frequency Rate

Normal

Monitor

VTST

VDD

or

VTST

X

1

0

1

0

OFF Disabled

9.8304

MHz

2.4576

MHz

9600

Forced

Monitor

VDD

VDD

$FFFF

(blank)

1

0

X

X

OFF Disabled

9.8304

MHz

2.4576

MHz

9600

User

VDD

or

VSS

VDD

or

VTST

Not

$FFFF

X

X

X

X

X Enabled

X

X

X

MON08

Function

[Pin No.]

VTST

[6]

RST

[4]

â

COM SSEL MOD0 MOD1

[8] [10] [12] [14]

â

â

OSC1

[13]

â

â

1. PTA0 must have a pullup resistor to VDD in monitor mode.

2. Communication speed in the table is an example to obtain a baud rate of 9600.

Baud rate using external oscillator is bus frequency / 256.

3. External clock is an 9.8304 MHz crystal on OSC1 and OSC2 or a 9.8304 MHz canned oscillator on OSC1.

4. X = donât care

5. MON08 pin refers to P&E Microcomputer Systemsâ MON08-Cyclone 2 by 8-pin connector.

NC 1

NC 3

NC 5

NC 7

NC 9

NC 11

OSC1 13

VDD 15

2 GND

4 RST

6 IRQ

8 PTA0

10 PTA1

12 PTB0

14 PTB1

16 NC

MC68HC908GR8A â¢ MC68HC908GR4A Data Sheet, Rev. 5

224

Freescale Semiconductor

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