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7477 Datasheet(PDF) 156 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  361 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 156 Page - Renesas Technology Corp

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1-149
7470/7471/7477/7478 GROUP USER’S MANUAL
HARDWARE
1.15 Reset
1.15 Reset
The microcomputer is reset by applying the “L” level to the RESET pin for 2
µs or more when the power
source voltage is within the standard value range. After that, when the “H” level is applied to the RESET
pin, the reset state of the microcomputer is released, so that the program is run starting with the reset
vector address.
1.15.1 Operation description
Figure 1.15.1 shows an internal processing sequence after reset release.
Fig. 1.15.1 Internal processing sequence after reset release
Internal clock
φ
FFFE16
AH
AL
FFFF16
AL,AH
XIN
RESET
Internal reset
Address bus
Data bus
SYNC
VCC
Internal clock
φ CPU reference clock frequency
f(XIN)/2 (ordinary mode immediately
after reset release)
AH, AL :
:
:
Content of reset vector address
Undefined
SYNC : CPU operation code fetch cycle
(This is a internal signal, so that it cannot be observed from the external unit.)
32768 counts of X IN pin input signal
2
µs or more
XIN
=



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