參數(shù)資料
型號: MC68HC705J2
廠商: Motorola, Inc.
英文描述: HCMOS MICROCONTROLLER UNIT
中文描述: HCMOS微控制器
文件頁數(shù): 47/82頁
文件大?。?/td> 327K
代理商: MC68HC705J2
MC68HC705J2
Rev. 2
BOOTLOADER MODE
MOTOROLA
8-1
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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, the MOR byte at location $0F00, and the user
vector addresses $0FF0–$0FFF. In MC68HC05J1 emulation mode, the bootloader
copies to the 1 Kbyte space located at EPROM addresses $0300–$06FF, the MOR
byte at location $0700, and the user vector addresses $07F0–$07FF. 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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