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| 型號(hào)： | M3822 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 8 Bits Microcomputer(8位單片機(jī)) |
| 中文描述： | 單芯片8位單片機(jī)（8位單片機(jī)） |
| 文件頁(yè)數(shù)： | 36/52頁(yè) |
| 文件大?。?/td> | 781K |
| 代理商： | M3822 |
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36
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3822 Group
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 2
μ
s or more. Then the RESET pin is returned to an “H”
level (the power source voltage should be between 2.5 V and
5.5 V, and the oscillation should be stable), reset is released. In or-
der to give the X
IN
clock time to stabilize, internal operation does
not begin until after 8200 X
IN
clock cycles (timer 1 and timer 2 are
connected together and 512 cycles of f(X
IN
)/16) are complete. Af-
ter the reset is completed, the program starts from the address
contained in address FFFD
16
(high-order byte) and address
FFFC
16
(low-order byte).
Make sure that the reset input voltage is less than 0.5 V for V
CC
of
2.5 V (Extended operating temperature version: the reset input
voltage is less than 0.6V for V
CC
of 3.0V).
Fig. 30 Internal state of microcomputer after reset
Fig. 29 Example of reset circuit
(Note)
0.2V
CC
0V
0V
CC
= 2.5V
Note. Reset release voltage : V
Power on
V
CC
RESET
V
CC
RESET
Power source voltage
detection circuit
Reset input
Power source
Register contents
00
16
(0001
16
)
Timer Y (low)
Port P0 direction register
Port P1 direction register
Port P2 direction register
PULL register B
Timer Y (high)
Serial I/O control register
UART control register
Timer X (high)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(0003
16
)
(0005
16
)
(0017
16
)
(001A
16
)
(001B
16
)
(0020
16
)
(0021
16
)
(0022
16
)
(0023
16
)
(0024
16
)
(0025
16
)
(0026
16
)
(0027
16
)
(0028
16
)
(0029
16
)
(002A
16
)
Address
Timer X (low)
Timer 1
Timer 2
Timer 3
Timer X mode register
Timer Y mode register
Timer 123 mode register
φ
output control register
00
16
(000F
16
)
1 1 1 0 0 0
0
0
Serial I/O status register (0019
16
)
1 0 0 0 0 0
0
0
Port P4 direction register
Port P5 direction register
Port P6 direction register
(0009
16
)
(000B
16
)
(000D
16
)
(25)
(26)
(27)
(0034
16
)
(0038
16
)
(0039
16
)
A-D control register
Segment output enable register
LCD mode register
PULL register A
(0016
16
)
0 0 0 0 1 0
1
1
Note
:
Undefined
The contents of all other registers and RAM are undefined
after reset, so they must be initialized by software.
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(003A
16
)
(003B
16
)
(003C
16
)
(003D
16
)
(003E
16
)
Interrupt edge selection register
CPU mode register
Interrupt request register 1
Interrupt request register 2
Interrupt control register 1
Interrupt control register 2
Processor status register
Program counter
1 0 0 1 0
0
0
Contents of address FFFC
16
(PS)
(PC
H
)
(PC
L
)
Contents of address FFFD
16
(003F
16
)
0 0 0 0 1 0
0
0
00
16
00
16
00
16
00
16
00
16
00
16
00
16
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
( 9 )
0
1
FF
16
FF
16
FF
16
FF
16
FF
16
01
16
FF
16
00
16
00
16
00
16
00
16
00
16
00
16
00
16
00
16
00
16
00
16
00
16
Port P7 direction register
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