参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 40/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
PERSONALITY EPROM
MC68HC05SB7
16-4
REV 2.1
NOTE
While the PEPGM bit is set and the VPP voltage level is applied to the IRQ/VPP
pin, do not access bits that are to be left unprogrammed (erased).
To program the PEPROM, VDD must be greater than 4.5 Vdc.
16.3
PEPROM READING
The following sequence shows how to read the PEPROM:
1.
Select a bit by writing to the PEBSR.
2.
Read the PEDATA bit in the PESCR.
3.
Store the PEDATA bit in RAM or in a register.
4.
Select another bit by changing the PEBSR.
5.
Continue reading and storing the PEDATA bits until the required
personality EPROM data is retrieved and stored.
Reading the PEPROM is easiest when each PEPROM column contains one byte.
Selecting a row 0 bit selects the rst bit, and incrementing the PEPROM bit select
register (PEBSR) selects the next bit in row 1 from the same column. Increment-
ing PEBSR seven more times selects the remaining bits of the column and ends
up selecting the bit in row 0 of the next column, thereby setting the row 0 ag,
PEPRZF.
NOTE
A PEPROM byte that has been read can be transferred to the personality EPROM
bit select register (PEBSR) so that subsequent reads of the PEBSR quickly yield
that PEPROM byte.
16.4
PEPROM ERASING
MCUs with windowed packages permit PEPROM erasure with ultraviolet light.
Erase the PEPROM by exposing it to 15 Ws/cm2 of ultraviolet light with a wave-
length of 2537 angstroms. Position the ultraviolet light source 1 inch from the win-
dow. Do not use a shortwave lter. The erased state of a PEPROM bit is a logic
zero.
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