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3886 Datasheet(PDF) 290 Page - Renesas Technology Corp

Part # 3886
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  380 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

3886 Datasheet(HTML) 290 Page - Renesas Technology Corp

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3886 Group User’s Manual
APPLICATION
2-173
2.15 Flash memory
Fig. 2.15.12 CPU reprogramming control program example (3)
*1: Waiting by software until VPP input voltage is stabilized at VPPL
is recommended. (Refer to Figure 2.15.14 and Figure 2.15.15
VPP voltage control timing B.)
*2: The wait time depends on VPP control circuit (Refer to Figure
2.15.14 and Figure 2.15.15 VPP voltage control timing C.)
CPU reprogramming mode
select bit = “0”
CPU reprogramming error
NO
YES
NO
Retry counter
=1000 ?
YES
NO
YES
Wait 5 ms *2
Continued to “CPU reprogramming
control program example (2)” on
previous page
Continued from “CPU reprogramming
control program example (2)” on
previous page
Port Pi1 = “0”
Apply VPP voltage = VPPL
waiting for stabilizing *1
CPU reprogramming
mode monitor flag
= “0” ?
CPU reprogramming
mode select bit
= “0”
Continued from ➂
➄ CPU reprogramming mode release
Initialize watchdog timer (write to
watchdog timer control register) to
prevent generation of watchdog timer
interrupt during this processing.
b
a



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