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4556 Datasheet(PDF) 141 Page - Renesas Technology Corp

Part # 4556
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  145 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4556 Datasheet(HTML) 141 Page - Renesas Technology Corp

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Rev.3.02
Dec 22, 2006
page 141 of 142
REJ03B0025-0302
4556 Group
Fig. 69 Pin configuration of built-in PROM version
PIN CONFIGURATION (TOP VIEW)
37
38
39
40
41
42
31
32
33
34
35
36
28
29
30
22
23
24
25
26
27
6
5
4
3
2
1
12
11
10
9
8
7
15
14
13
21
20
19
18
17
16
XIN
XOUT
CNVSS
XCIN/D6
XCOUT/D7
RESET
COM0
COM1
COM2
COM3
SEG0/VLC3
SEG1/VLC2
SEG2/VLC1
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
VSS
VDD
C/CNTR
D5/INT
D4
D3
D2
D1
D0
P13/SEG28
P12/SEG27
P11/SEG26
P10/SEG25
P03/SEG24
P02/SEG23
P01/SEG22
P00/SEG21
P23/SEG20
P22/SEG19
P21/SEG18
P20/SEG17
VDD
VSS
XIN
XOUT
VPP
SCLK
VDD
PGM
VDD
RESET
SDA
ROM CODE ACCESS PROTECTION
We would like to support a simple ROM code protection function
that prevents a party other than the ROM-code owner to read and
reprogram the built-in PROM code of the MCU.
First, Programmers must check the ID-code of the MCU.
If the ID-code is not blank, Programmer verifies it with the input ID-
code. When the ID-codes do not match, Programmer will reject all
further operations.
The MCU has each 10 bits of dedicated ROM spaces in address
009016 to 009616, as an ID-code (referred to as “the ID-code”) en-
abling a Programmer to verify with the input ID-code and validate
further operations.
Fig. 70 ROM-Code Protection ID Location
ID7
ID6
ID5
ID4
ID3
ID2
ID1
009716
009616
009516
009416
009316
009216
009116
009016
Address



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