參數(shù)資料
型號(hào)： MC68HC05SB7
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： MO-150, SSOP-28
文件頁數(shù)： 39/170頁
文件大?。?/td> 2161K
代理商： MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
PERSONALITY EPROM
MOTOROLA
REV 2.1
16-3
PEPGM — PEPROM Program Control
This read/write bit controls the switches that apply the programming voltage on
the IRQ/VPP pin to the selected PEPROM cell. Reset clears the PEPGM bit.
1 = Programming voltage applied to array bit.
0 = Programming voltage not applied to array bit.
PEPRZF — PEPROM Row Zero Flag
This read-only bit is set when the PEPROM bit select register selects the rst
row (row zero) of the PEPROM array. Selecting any other row clears PEPRZF.
Monitoring PEPRZF can reduce the code needed to access one byte of eight
PEPROM locations. Reset clears the PEPROM bit select register thereby set-
ting the PEPRZF bit by default.
1 = Row zero selected.
0 = Row zero not selected.
16.2
PEPROM PROGRAMMING
The PEPROM can be programmed by user software with the VPP voltage level
applied to the IRQ/VPP pin. The following sequence shows how to program each
PEPROM bit:
1.
Select a PEPROM bit by writing to the PEBSR.
2.
Set the PEPGM bit in the PESCR.
3.
Wait 3 milliseconds.
4.
Clear the PEPGM bit.
5.
Move to next PEPROM bit to be programmed in step 1.
Table 16-1. PEPROM Bit Selection
PEBSR
PEPROM Bit Selected
$00 - $07
Row 0 - Row 7
Column 0
$08 - $0F
Row 0 - Row 7
Column 1
$10 - $17
Row 0 - Row 7
Column 2
$18 - $1F
Row 0 - Row 7
Column 3
$20 - $27
Row 0 - Row 7
Column 4
$28 - $2F
Row 0 - Row 7
Column 5
$30 - $37
Row 0 - Row 7
Column 6
$38 - $3F
Row 0 - Row 7
Column 7
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