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HC705J2 Datasheet(PDF) 63 Page - Motorola, Inc

Part # HC705J2
Description  M68HC05 FAMILY OF 8 BIT MICROCONTROLLER UNITS
PDF  78 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

HC705J2 Datasheet(HTML) 63 Page - Motorola, Inc

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MC68HC705J2
BOOTLOADER
MODE
MOTOROLA
8-1
SECTION 8
BOOTLOADER MODE
This section describes how to use the bootloader ROM to download to the
on-chip EPROM.
8.1 Bootloader ROM
The bootloader ROM, located at addresses $0F01–$0FEF, contains routines for
copying to the on-chip EPROM from an external EPROM or from a personal
computer.
In MC68HC705J2 native mode, the bootloader copies to the 2 Kbyte space
located at EPROM addresses $0700–$0EFF.
In MC68HC05J1 emulation
mode, the bootloader copies to the 1 Kbyte space located at EPROM addresses
$0300–$06FF.
The addresses of the copied code must correspond to the
internal addresses to which the code is copied.
The bootloader ignores all
other addresses.
The COP timer is automatically disabled in bootloader mode.
8.1.1 External EPROM Downloading
Figure 8-1 shows the circuit used to download to the on-chip EPROM from a
2764 EPROM. The bootloader circuit includes an external 12-bit counter to
address the EPROM containing the code to be copied.
Operation is fastest when unused external EPROM addresses contain $00.



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