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M37151M6 Datasheet(PDF) 92 Page - Renesas Technology Corp

Part # M37151M6
Description  SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37151M6 Datasheet(HTML) 92 Page - Renesas Technology Corp

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M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP
Rev.1.00
Nov 01, 2002
page 92 of 136
REJ03B0129-0100Z
8.13. 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
µs or more, then return to HIGH. Then, as
shown in Figure 8.13.2, reset is released and the program starts from
the address formed by using the content of address FFFF16 as the
high-order address and the content of the address FFFE16 as the
low-order address. The internal states of the microcomputer at reset
are shown in Figures 8.2.2 to 8.2.5.
An example of the reset circuit is shown in Figure 8.13.1.
The reset input voltage must be kept 0.9 V or less until the power
source voltage surpasses 4.5 V.
Fig.8.13.2 Reset Sequence
Fig.8.13.1 Example of Reset Circuit
Power source voltage 0 V
Reset input voltage 0 V
4.5 V
0.9 V
Power on
Vcc
RESET
Vss
Microcomputer
1
5
4
3
0.1
µF
M51953AL
XIN
φ
RESET
Internal RESET
SYNC
Address
Data
32768 count of XIN
clock cycle (See note 3)
Reset address from the vector table
?
?
01, S
01, S-1 01, S-2
FFFE
FFFF
ADH,
ADL
?
?
?
?
?
ADL
ADH
Notes 1 : f(XIN) and f(
φ) are in the relation : f(XIN) = 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, “FF16” is set
in timer 3 and “0716” is set to timer 4. Timer 3 counts down
with f(XIN)/16, and reset state is released by the timer 4
overflow signal.


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