參數資料
型號： MC68HC705CL48
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝： TQFP-112
文件頁數： 50/145頁
文件大?。?/td> 673K
代理商： MC68HC705CL48
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
MOTOROLA
REV 2.0
C-3
C.4
EPROM PROGRAMMING
Programming the on-chip EPROM is achieved by using the Program Control
Register located at address $26.
Please contact Motorola for programming board availability.
C.4.1 EPROM Program Control Register (EPCR $26)
This register is provided for programming the on-chip EPROM in the
MC68HC705CL16.
ELAT—EPROM LATch control
0 =
EPROM address and data bus congured for normal reads
1 =
EPROM address and data bus congured for programming (writes
to EPROM cause address and data to be latched). EPROM is in
programming mode and cannot be read if ELAT is 1. This bit should
not be set when no programming voltage is applied to the Vpp pin.
PGM—EPROM ProGraM command
0 =
Programming power is switched OFF from EPROM array.
1 =
Programming power is switched ON to EPROM array. If ELAT
≠ 1,
then PGM = 0.
C.4.2 Programming Sequence
The EPROM programming sequence is:
1.
Set the ELAT bit
2.
Write the data to the address to be programmed
3.
Set the PGM bit
4.
Delay for a time tPGMR
5.
Clear the PGM bit
6.
Clear the ELAT bit
The last two steps must be performed with separate CPU writes.
EPCR
$0026
bit-7
bit-6
bit-5
bit4
bit-3
bit-2
bit1
bit-0
Read
RESERVED
ELAT
PGM
Write
Reset
0000
0
000
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