參數(shù)資料
型號: 7643
英文描述: IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE
中文描述: 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03
文件頁數(shù): 58/120頁
文件大?。?/td> 1369K
代理商: 7643
Rev.1.00 Jul 30, 2003 page 58 of 119
7643 Group
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 20 cycles or more of
φ
. Then the RESET pin is returned to
an “H” level, and reset is released. They must be performed when
the power source voltages are between 3.00 V and 3.60 V or 4.15
V and 5.25 V.
After the reset is completed, the program starts from the address
contained in address FFFA
16
(high-order byte) and address
FFFB
16
(low-order byte).
After oscillation has restarted, the timers 1 and 2 secures waiting
time for the internal clock
φ
oscillation stabilized automatically by
setting the timer 1 to “FF
16
” and timer 2 to “01
16
”. The internal
clock
φ
retains “H” level until Timer 2’s underflow and it cannot be
supplied until the underflow.
The pins state during reset are follows:
When CNVss = “H”
Ports P0, P1, P3
3
to P3
7
Pins other than above mentioned ports
When CNVss = “L”
All pins
: Outputting
: Inputting
: Inputting.
Fig. 54 Reset sequence
Fig. 53 Reset circuit example
(Note)
0.2V
CC
0V
0V
Poweron
V
CC
RESET
V
CC
RESET
Power source
voltage detection
circuit
Power source
voltage
Reset input
voltage
Note
:
Reset release voltage ; Vcc = 3.00 or 4.15 V
RESET
Internal
reset
Data
φ
Address
SYNC
X
IN
: 512 clock cycles
FFFA
FFFB
AD
H
,
L
AD
L
AD
H
Reset address from
the vector table.
Notes:
The question marks () indicate an undefined state that depends on the previous state.
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