參數(shù)資料
型號： MC68HC705E6MDWR2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： PLASTIC, SOIC-28
文件頁數(shù)： 49/140頁
文件大?。?/td> 1141K
代理商： MC68HC705E6MDWR2
Modes of Operation and Pin Descriptions
MC68HC05E6 — Rev. 1.0
16
Modes of Operation and Pin Descriptions
MOTOROLA
Bootloader
functions
The bootloader code deals with the copying of user code from an
external EPROM into the on-chip EPROM. The bootloader function can
only be used with an external EPROM. The bootloader performs a
programming pass followed by a verify pass.
Two pins, PC0 and PC1, are used to drive the PROG and VERF LED
outputs. While the EPROM is being programmed, the PROG LED lights
up; when programming is complete, the internal EPROM contents are
compared to that of the external EPROM and, if they match exactly, the
VERF LED lights up.
The EPROM must be in the erased state before performing a program
cycle. The erased state of the EPROM is $00.
EPROM
programming
instructions
The following procedure should be carried out when programming the
EPROM. In order to prevent damage to the device, VDD should always be
applied to the part before VPP when applying power. Similarly, VPP should
be removed from the part before VDD when switching the power off.
1. Turn off power to the circuit.
2. Install the MCU and the EPROM.
3. Select the bootloader function:
Program 1 byte: Open S1 and S2 and close S3.
Program 4 bytes: Open S1, S2 and S3.
Verify only: Open S1 and S3 and close S2.
4. Close switch S4 to hold the MCU in reset.
5. Apply VDD to the circuit.
6. Apply the EPROM programming voltage (VPP) to the circuit.
7. Open switch S4 to take the MCU out of reset.
During programming the PROG LED turns on and is switched off
when the verification routine begins. If verification is successful,
the VERF LED turns on. If the bootloader finds an error during
verification, it puts the error address on the external address bus
and stops running.
8. Close switch S4 to hold the MCU in reset.
9. Remove the VPP voltage.
10. Remove the VDD voltage.
NOTE:
EPROM programming must be carried out at room temperature.
4-pin
相關(guān)PDF資料
PDF描述
MC68HC05E6MDWR2 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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