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參數(shù)資料
| 型號： | HC05K3GRS |
| 英文描述： | 68HC05K3 General Release Specification |
| 中文描述： | 68HC05K3一般版本規(guī)范 |
| 文件頁數(shù)： | 83/132頁 |
| 文件大小： | 1188K |
| 代理商： | HC05K3GRS |
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Personality EEPROM (PEEPROM)
PEEPROM Registers
MC68HC05K3 — Revision 4.0
TechnicalData
MOTOROLA
Personality EEPROM (PEEPROM)
83
Table 9-1. Software to Read PEEPROM
pebsr
pescr
ram
equ
equ
equ
$000e
$000f
$000c
lda
sta
clr
#$xy
pebsr
ram
; xy is base addresses and should start on
; a first column (i.e., $00, $08, $10, $18, etc).
; clear ram location used for final result
peep_rd
rol
ror
inc
brclr
pescr
ram
pebsr
0,pescr,peep_rd
; c = pedata (c = carry bit)
; ram = c
; go to next bit in array.
; 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 Bit
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 Bit
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 V
DD
supply voltages
greater than or equal to 2.7 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.
Onceactivated,andafterstartuptimet
CP
,thechargepumpcontinues
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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