HC705J2 datasheet(63/78 Pages) MOTOROLA

tên linh kiện	HC705J2

Giải thích chi tiết về linh kiện	M68HC05 FAMILY OF 8 BIT MICROCONTROLLER UNITS

PDF	78 Pages

Scroll/Zoom	100%

nhà sản xuất	MOTOROLA [Motorola, Inc]

Trang chủ	http://www.freescale.com

Logo

63 / 78 page

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.

HC705J2 bảng dữ liệu(PDF) 63 Page - Motorola, Inc