參數(shù)資料
型號: MC68HC05P18MDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 96/144頁
文件大?。?/td> 1348K
代理商: MC68HC05P18MDW
Operating Modes
User Modes
MC68HC(8)05P18 — Rev. 2.0
Advance Information
MOTOROLA
Operating Modes
55
6.3.2 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 1. 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.
6.3.2.1 Bulk Erase/Blank Verify
To use the bootloader circuit to bulk erase the user EEPROM, follow this
sequence:
1. Close RESET switch and PTC4 switch so these pins are held low.
2. Apply 12-V power to IRQ.
3. Release RESET.
4. Programming LED will turn on while bulk erase is occurring.
5. When bulk erase is finished, programming LED will turn off.
6. When blank verify is finished, verify LED will turn on.
7. Close RESET switch.
8. Remove 12 V from IRQ, then remove power.
Table 6-2. Bootloader Functions
PTC4
Function
0
Bulk erase/blank verify
1
Bulk erase/program/verify
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