參數(shù)資料
型號: MC68HC805K3DW
廠商: MOTOROLA 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): 106/119頁
文件大小: 496K
代理商: MC68HC805K3DW
General Release Specification
PEEPROM Read Access
MC68HC805K3 — Rev. 1.0
MOTOROLA
Personality EEPROM
87
Reading the PEEPROM is easiest when each row in the PEEPROM
array is mapped to contain one byte of data. Selecting a column zero bit
selects the first bit in the row; and incrementing the PEEPROM bit select
register (PEBSR) selects the next (column 1) bit from the same row.
Incrementing the PEBSR seven more times selects the remaining bits of
the row and carries over to select column zero of the next row, thereby
setting the column zero flag, PEPCZF in the PESCR. The number of
increments per row can be controlled by looping on a test of the PEPCZF
flag bit.
The complete array can be easily accessed by starting with $7F for the
PEBSR and decrementing the PEBSR after each access of the PEDATA
bit. The decrement sequence can end when the contents of the PEBSR
are zero.
NOTE:
One byte of data from the PEEPROM can be re-created in the PEBSR
itself. This can be done if the read routine builds the 8-bit data byte in the
index register or the accumulator and then transfers that result to the
PEBSR when completed. Subsequent reads of the PEBSR quickly yield
that retrieved data byte.
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