參數(shù)資料
型號： MC68HC805K3DW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PDSO16
封裝： SOIC-16
文件頁數(shù)： 105/119頁
文件大?。?/td> 2870K
代理商： MC68HC805K3DW
General Release Specication
PEEPROM Programming
MC68HC805K3 — Rev. 1.0
86
Personality EEPROM
9.4 PEEPROM Programming
The PEEPROM can be programmed using a Motorola programmer or in
the user application if the VDD supply source is at least 3.0 Vdc. In the
latter case, the programming software must be provided in the user
EEPROM and use some external pins in either a serial or parallel
method for data transfer and/or access. Each bit of the PEEPROM can
be programmed as follows:
1. Write the desired bit location to be programmed into the PEBSR
located at $000E.
2. Set the PEPGM and CPEN bits in the PESCR located at $000F.
3. Wait for a tEPGM time delay.
4. Clear the PEPGM and CPEN bits.
The PEEPROM is then ready to be set up for another bit of data for
programming.
The programming of a PEEPROM bit only requires access of that bit
through the PEBSR followed by setting the PEPGM and CPEN bits in
the PESCR. Do not access any bits that are to be left unprogrammed
(erased) until all the PEPGM, PEBYTE, PEBULK, and CPEN bits in the
PESCR are cleared. Always clear the PEPGM, PEBYTE, PEBULK, and
CPEN bits before altering the PEBSR register.
9.5 PEEPROM Read Access
The contents of the PEEPROM are read by the following sequence:
1. Write the desired bit location to be read into the PEBSR located at
$000E.
2. Read the state of the PEDATA bit in the PESCR located at $000F.
3. Store the state of the PEDATA bit into RAM or a register.
4. Select another bit by changing the PEBSR.
5. Continue reading and storing the PEDATA bit states until all the
required PEEPROM data has been accessed.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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