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7540 Group
Rev.4.00
Jun 21, 2004
page 42 of 82
REJ03B0011-0400Z
Reset Circuit
The microcomputer is put into a reset status by holding the RE-
SET pin at the “L” level for 2
s or more when the power source
voltage is 2.2 to 5.5 V and XIN is in stable oscillation.
After that, this reset status is released by returning the RESET pin
to the “H” level. The program starts from the address having the
contents of address FFFD16 as high-order address and the con-
tents of address FFFC16 as low-order address.
In the case of f(
φ) ≤ 6 MHz, the reset input voltage must be 0.9 V
or less when the power source voltage passes 4.5 V.
In the case of f(
φ) ≤ 4 MHz, the reset input voltage must be 0.8 V
or less when the power source voltage passes 4.0 V.
In the case of f(
φ) ≤ 2 MHz, the reset input voltage must be 0.48 V
or less when the power source voltage passes 2.4 V.
In the case of f(
φ) ≤ 1 MHz, the reset input voltage must be 0.44 V
or less when the power source voltage passes 2.2 V.
Fig. 43 Example of reset circuit
Fig. 44 Timing diagram at reset
(Note)
0.2 VCC
0 V
Poweron
VCC
RESET
VCC
RESET
Power source
voltage
detection circuit
Power source
voltage
Reset input
voltage
Note : Reset release voltage Vcc = 2.2 V
Data
Address
8-13 clock cycles
Reset address from the
vector table
1 : An on-chip oscillator applies about RING2 MHz,
φ250 kHz frequency clock
at average of Vcc = 5 V.
2 : The mark “?” means that the address is changeable depending on the previous state.
3 : These are all internal signals except RESET.
Notes
??
FFFC
FFFD
ADH,ADL
??
?
??
ADL
ADH
??
?
Clock from on-chip
oscillator RING
φ
RESET
RESETOUT
SYNC
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| M37540E2FP | 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP32 |
| M37542F8GP | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP32 |
| M37542M4-XXXSP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP32 |
| M37542F8SP | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDIP32 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37540E8T-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540E8V-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540E8V-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540EXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540M2T-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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