参数资料
型号: M38049FFHKP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8.4 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数: 92/118页
文件大小: 1202K
代理商: M38049FFHKP
Rev.1.01
Jan 25, 2005
page 73 of 114
REJ03B0131-0101Z
3804 Group (Spec. H)
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 16 cycles or more of XIN. Then the RESET pin is returned
to an
H” level (the power source voltage should be between 2.7 V
to 5.5 V, and the oscillation should be stable), reset is released.
After the reset is completed, the program starts from the address
contained in address FFFD16 (high-order byte) and address
FFFC16 (low-order byte).
Input to the RESET pin in the following procedure.
qWhen power source is stabilized
(1) Input
L” level to RESET pin.
(2) Input
L” level for 16 cycles or more to XIN pin.
(3) Input
H” level to RESET pin.
qAt power-on
(1) Input
L” level to RESET pin.
(2) Increase the power source voltage to 2.7 V.
(3) Wait for td(P-R) until internal power source has stabilized.
(4) Input
L” level for 16 cycles or more to XIN pin.
(5) Input
H” level to RESET pin.
Fig. 71 Reset sequence
Fig. 70 Reset circuit example
RESET
Internal
reset
Data
φ
Address
SYNC
XIN: 10.5 to 18.5 clock cycles
XIN
?
FFFC
FFFD
ADH,L
?
ADL
ADH
1:
The frequency relation of f(X
IN
) and f(
φ ) is f(X
IN
)=8 f(
φ ).
2:
The question marks (?) indicate an undefined state that depends on the previous state.
Reset address from the vector table.
Notes
VCC
RESET
VCC
RESET
Example at VCC = 5V
td(P-R)+XIN 16 cycles or more
2.7 V
0.2VCC or less
0V
VCC
RESET
0V
VCC
RESET
td(P-R)+XIN 16 cycles or more
5V
2.7 V
Power source
voltage detection
circuit
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