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)： 102/119頁
文件大?。?/td> 2870K
代理商： MC68HC805K3DW
General Release Specification
PEEPROM Registers
MC68HC805K3 — Rev. 1.0
Personality EEPROM
83
Table 9-1. Software to Read PEEPROM
pebsr
equ
$000e
pescr
equ
$000f
ram
equ
$000c
lda
#$xy
; xy is base addresses and should start on
sta
pebsr
; a first column (i.e., $00, $08, $10, $18, etc).
clr
ram
; clear ram location used for final result
peep_rd
rol
pescr
; c = pedata (c = carry bit)
ror
ram
; ram = c
inc
pebsr
; go to next bit in array.
brclr
0,pescr,peep_rd
; care data here, loop until all bytes read
; peep_rd loop ends when PEPCZF = 1.
; At end of loop, ram contains one row of PEEP data.
CPCLK — Charge Pump Clock Source
The CPCLK bit is a read/write bit that controls the source of the clock
for the charge pump. When the CPCLK bit is set, the charge pump is
driven by the PH2 bus clock. When the CPCLK bit is cleared, the
charge pump is driven from an internal ring oscillator. The CPCLK bit
is cleared when the device is in reset.
In systems where the desired PH2 clock rate is below 1 MHz, the
CPCLK bit should be cleared to enable the internal ring oscillator.
Otherwise, the charge pump does not attain sufficient program/erase
voltage because the clock source is too slow.
CPEN — Charge Pump Enable
The CPEN bit is a read/write bit to control the on-chip charge pump
for programming and erasure of the Personality EEPROM. This
charge pump is only intended for use at VDD supply voltages
above 3.0 Vdc. The charge pump is activated when both the CPEN
bit is set and one of the program or erase bits is also set (PEPGM,
PEBYTE, or PBULK). The charge pump supplies the required
programming voltage to the Personality EEPROM array. Once
activated, and after startup time tCP, the charge pump continues to
operate until all the program and erase bits are cleared.
NOTE:
If the personality EEPROM is read while the CPEN bit is set, the data is
unknown.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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