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參數資料
型號: MC68HC705X4DW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數: 19/156頁
文件大小: 926K
代理商: MC68HC705X4DW
Modes of Operation and Pin Descriptions
Bootloader modes for the MC68HC05X4 and MC68HC705X4
MC68HC05X4 Rev 1.0
MOTOROLA
Modes of Operation and Pin Descriptions
For More Information On This Product,
Go to: www.freescale.com
19
7-modes
EPROM containing the user code are incremented independently it is
essential that the data layout in the 2764 EPROM conforms exactly to
the MC68HC705X4memory map.
The bootloader uses an external 12-bit counter with a clock and a reset
function to address the memory device containing the code to be copied.
The 12-bit counter can address up to 4K bytes of memory therefore a
port pin must be used to address the additional memory space.
NOTE:
In bootloader mode the device will always default to the divide-by-10
option for the oscillator division ratio.
EPROM
programming
register
All necessary manipulation of this register is carried out automatically by
the bootloader routine.
ELAT — EPROM address and data latch
1 = Configures EPROM address and data buses for programming.
0 = Configures EPROM address and data buses for normal
operation.
EPGM — EPROM programming power control
1 = Switches EPROM programming power on.
0 = Switches EPROM programming power off.
A byte of EPROM is programmed using the following sequence:
set ELAT
write data to the desired EPROM address
set EPGM for time t
PROG
clear EPGM/ELAT
Address:
$1G00
Bit 7
6
5
4
3
2
1
Bit 0
0
0
0
0
0
ELAT
0
EPGM
Reset:
0
0
0
0
0
0
0
0
Figure 3. EPROM Programming Register (EPROG)
F
Freescale Semiconductor, Inc.
n
.
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