HC805P18GRSSLASHD datasheet(38/111 Pages) NXP

tên linh kiện	HC805P18GRS/D

Giải thích chi tiết về linh kiện	The Motorola MC68HC805P18 microcontroller is a member of the M68HC05

PDF	111 Pages

Scroll/Zoom	100%

nhà sản xuất	NXP [NXP Semiconductors]

Trang chủ	http://www.nxp.com

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GENERAL RELEASE SPECIFICATION

OPERATING MODES

MC68HC805P18

6-2

6.2.2 Bootloader Mode

Bootloader mode is entered upon the rising edge of RESET if the IRQ pin is twice

the VDD voltage and the TCAP/PD7 pin is at logic one. In bootloader mode, the

user EEPROM and mask option register (MOR) bytes can be erased and

programmed. Figure 6-1 shows the bootloader circuit. PTC4 determines whether

erasing or programming will occur as shown in Table 6-2.

Bulk Erase/Blank Verify

To use the bootloader circuit to bulk erase the user EEPROM, follow this

sequence:

Close RESET switch and PTC4 switch so these pins are held low.

Apply 12 V power to IRQ.

Release RESET.

Programming LED will turn on while bulk erase is occurring.

When bulk erase is finished, programming LED will turn off.

When blank verify is finished, verify LED will turn on.

Close RESET switch.

Remove 12 V from IRQ, then remove power.

Table 6-2. Bootloader Functions

PTC4

Function

Bulk Erase/Blank Verify

Bulk Erase/Program/Verify

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC805P18GRS/D bảng dữ liệu(PDF) 38 Page - NXP Semiconductors