參數(shù)資料
型號(hào): 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(shù): 15/156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
15
NOTE:
‘RAMST’ = the address of the first byte of RAM
‘BTROM’ = the address of the first byte of Bootloader ROM = $1F01
=$0050
Figure 1. MC68HC05X4 bootloader circuit
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
Overrun error
V
DD
V
DD
V
DD
2 x V
DD
MDS/VPP
VDD
RESET
VSS
6
7
8
9
10
11
12
13
22
23
24
25
26
27
28
1
V
DD
18 pF
18 pF
OSC1
OSC2
3
4
15
2
14
1.5 k
5
RXD
TXD
PA3
X
0
1
PA2
0
1
1
Mode
Test port B
Execute user code
Load user code
Note:
All resistors are 10 k
unless otherwise
specified
For 9600 baud operation, crystal should be 20
MHz (with divide-by-10 option selected)
or 4 MHz (for divide-by-2 option)
MC68HC05X4
V
DD
3-modes
F
Freescale Semiconductor, Inc.
n
.
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