參數(shù)資料
型號: M37225M6
廠商: Mitsubishi Electric Corporation
英文描述: Single Chip 8 Bits Microcomputer(8位單片機)
中文描述: 單芯片8位單片機(8位單片機)
文件頁數(shù): 86/133頁
文件大?。?/td> 1610K
代理商: M37225M6
86
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37225M6–XXXSP, M37225M8–XXXSP
M37225ECSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.12. RESET CIRCUIT
When the oscillation of a quartz-crystal oscillator or a ceramic reso-
nator is stable and the power source voltage is 5 V
±
10 %, hold the
RESET pin at LOW for 2
μ
s or more, then return is to HIGH. Then, as
shown in Figure 8.12.2, reset is released and the program starts form
the address formed by using the content of address FFFF
16
as the
high-order address and the content of the address FFFE
16
as the
low-order address. The internal state of microcomputer at reset are
shown in Figures 8.2.3 to 8.2.6.
An example of the reset circuit is shown in Figure 8.12.1.
The reset input voltage must be kept 0.9 V or less until the power
source voltage surpasses 4.5 V.
Fig.8.12.2 Reset Sequence
Fig.8.12.1 Example of Reset Circuit
Power source voltage 0 V
Reset input voltage 0 V
4.5 V
0.9 V
Poweron
Vcc
RESET
Vss
Microcomputer
1
5
4
3
0.1
μ
F
M51953AL
X
IN
φ
RESET
Internal RESET
SYNC
Address
Data
32768 count of X
IN
clock cycle (See note 3)
Reset address from the vector table
01, S
01, S-1 01, S-2
FFFE
FFFF
AD
H
,
AD
L
AD
L
AD
H
Notes 1
:
f(X
IN
) and f(
φ
) are in the relation : f(X
IN
) = 2·f (
φ
).
2 :
A question mark () indicates an undefined state that
depends on the previous state.
3 :
Immediately after a reset, timer 3 and timer 4 are
connected by hardware. At this time, “FF
16
” is set
in timer 3 and “07
16
” is set to timer 4. Timer 3 counts down
with f(X
IN
)/16, and reset state is released by the timer 4
overflow signal.
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