参数资料
型号: MCR705JP7CDWE
厂商: Freescale Semiconductor
文件页数: 22/164页
文件大小: 0K
描述: MCU 8BIT 224B RAM 28-SOIC
标准包装: 26
系列: HC05
核心处理器: HC05
芯体尺寸: 8-位
速度: 2.1MHz
连通性: SIO
外围设备: POR,温度传感器,WDT
输入/输出数: 22
程序存储器容量: 6KB(6K x 8)
程序存储器类型: OTP
RAM 容量: 224 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 4x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
Personality EPROM (PEPROM)
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
118
Freescale Semiconductor
12.4 PEPROM Reading
This 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 first bit, and incrementing the PEPROM bit select register (PEBSR) selects the next bit in row
1 from the same column. Incrementing 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 flag, PEPRZF.
NOTE
A PEPROM byte that has been read can be transferred to the personality
EPROM bit select register (PEBSR) as a temporary storage location such
that subsequent reads of the PEBSR quickly yield that PEPROM byte.
12.5 PEPROM Erasing
MCUs with windowed packages permit PEPROM erasing with ultraviolet light. Erase the PEPROM by
exposing it to 15 Ws/cm2 of ultraviolet light with a wavelength of 2537 angstroms. Position the ultraviolet
light source 1 inch from the window. Do not use a shortwave filter. The erased state of a PEPROM bit is
a logic 0.
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