參數(shù)資料
型號: MCHC705KJ1CPE
廠商: Freescale Semiconductor
文件頁數(shù): 28/108頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 64 BYTES RAM 16PDIP
標準包裝: 25
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 4MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 10
程序存儲器容量: 1.2KB(1.2K x 8)
程序存儲器類型: OTP
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 管件
Memory
MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
26
Freescale Semiconductor
2.7.2 EPROM Programming Register
The EPROM programming register (EPROG) contains the control bits for programming the
EPROM/OTPROM.
ELAT — EPROM Bus Latch Bit
This read/write bit latches the address and data buses for EPROM/OTPROM programming. Clearing
the ELAT bit automatically clears the EPGM bit. EPROM/OTPROM data cannot be read while the
ELAT bit is set. Reset clears the ELAT bit.
1 = Address and data buses configured for EPROM/OTPROM programming the EPROM
0 = Address and data buses configured for normal operation
MPGM — MOR Programming Bit
This read/write bit applies programming power from the IRQ/VPP pin to the mask option register. Reset
clears MPGM.
1 = Programming voltage applied to MOR
0 = Programming voltage not applied to MOR
EPGM — EPROM Programming Bit
This read/write bit applies the voltage from the IRQ/VPP pin to the EPROM. To write the EPGM bit, the
ELAT bit must be set already. Reset clears EPGM.
1 = Programming voltage (IRQ/VPP pin) applied to EPROM
0 = Programming voltage (IRQ/VPP pin) not applied to EPROM
NOTE
Writing logic 1s to both the ELAT and EPGM bits with a single instruction
sets ELAT and clears EPGM. ELAT must be set first by a separate
instruction.
Bits [7:3] — Reserved
Take the following steps to program a byte of EPROM/OTPROM:
1.
Apply the programming voltage, VPP, to the IRQ/VPP pin.
2.
Set the ELAT bit.
3.
Write to any EPROM/OTPROM address.
4.
Set the EPGM bit and wait for a time, tEPGM.
5.
Clear the ELAT bit.
2.7.3 EPROM Erasing
The erased state of an EPROM bit is logic 0. Erase the EPROM by exposing it to 15 Ws/cm2 of ultraviolet
light with a wavelength of 2537 angstroms. Position the ultraviolet light source one inch from the EPROM.
Do not use a shortwave filter.
Address:
$0018
Bit 7
654321
Bit 0
Read:
00000
ELAT
MPGM
EPGM
Write:
RRRR
Reset:
00000000
= Unimplemented
R
= Reserved
Figure 2-3. EPROM Programming Register (EPROG)
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