MC68HC05X4 Datasheet, PDF(15/156 Page) Motorola, Inc – HCMOS Microcontroller Unit

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MC68HC05X4 Datasheet, PDF (15/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

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Freescale Semiconductor, Inc.

Modes of Operation and Pin Descriptions

Bootloader modes for the MC68HC05X4 and MC68HC705X4

NOTE: âRAMSTâ = the address of the first byte of RAM

=$0050

âBTROMâ = the address of the first byte of Bootloader ROM = $1F01

2 x VDD

RXD

TXD

VDD

5

MDS/VPP

3

OSC1

PA0 6

PA1 7

4

OSC2

PA2 8

PA3 9

PA4 10

VDD

PA5 11

PA6 12

PA7 13

18 pF

18 pF

VDD

1.5 kâ¦

VDD

15

VDD

2

RESET

14

VSS

Overrun error

PB0 22

VDD

PB1 23

PB2 24

PB3 25

PB4 26

PB5 27

PB6 28

PB7 1

MC68HC05X4

Note:

â¢ All resistors are 10 kâ¦ unless otherwise

specified

â¢ For 9600 baud operation, crystal should be 20

MHz (with divide-by-10 option selected)

or 4 MHz (for divide-by-2 option)

PA3 PA2

X0

01

11

Mode

Test port B

Execute user code

Load user code

3-modes

Figure 1. MC68HC05X4 bootloader circuit

Modes of Operation and Pin Descriptions

For More Information On This Product,

Go to: www.freescale.com

MC68HC05X4 Rev 1.0

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