MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 39

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MC68HC705P9CDW

Manufacturer Part Number
MC68HC705P9CDW
Description
Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet

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3.6.1.2 Bootloader ROM
MC68HC705P9 — Rev. 4.0
MOTOROLA
Take the following steps to program a byte of EPROM/OTPROM:
The bootloader ROM, located at addresses $1F00–$1FEF, contains
routines for copying an external EPROM to the on-chip
EPROM/OTPROM.
The bootloader copies to the following EPROM/OTPROM addresses:
The addresses of the code in the external EPROM must match the
MC68HC705P9 addresses. The bootloader ignores all other addresses.
Figure 3-4
EPROM/OTPROM from a 2764 EPROM. The bootloader circuit includes
an external 12-bit counter to address the external EPROM. Operation is
fastest when unused external EPROM addresses contain $00. The
bootloader function begins when a rising edge occurs on the RESETpin
while the V
logic one.
1. Apply 16.5 V to the IRQ/V
2. Set the LATCH bit.
3. Write to any EPROM/OTPROM address.
4. Set the EPGM bit for a time, t
5. Clear the LATCH bit.
Freescale Semiconductor, Inc.
For More Information On This Product,
voltage.
$0020–$004F
$0100–$0900
$1FF0–$1FFF
PP
shows the circuit for downloading to the on-chip
Go to: www.freescale.com
voltage is on the IRQ/V
Memory
PP
pin.
EPGM
PP
pin, and the PD7/TCAP pin is at
, to apply the programming
EPROM/OTPROM
Technical Data
Memory
39

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