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M3885 Datasheet(PDF) 73 Page - Renesas Technology Corp

Part # M3885
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  103 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M3885 Datasheet(HTML) 73 Page - Renesas Technology Corp

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3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
72
FLASH MEMORY MODE
The 3885 (flash memory version) has an internal new DINOR
flash memory that can be reprogrammed with 2 power sources
when VCC is 3.3 V.
For this flash memory , two flash memory modes are available in
which to read, program, and erase: parallel I/O and a CPU repro-
gram mode in which the flash memory can be manipulated by the
Central Processing Unit (CPU). Each mode is detailed in the
pages to follow.
Fig. 72 Block diagram of flash memory version
The flash memory of the 3885 is divided into User ROM area and
Boot ROM area as shown in Figure 72.
In addition to the ordinary user ROM area to store a microcom-
puter operation control program, 3885 program has a Boot ROM
area that is used to store a program to control reprogramming in
CPU reprogram mode. The user can store a reprogram control
software in this area that suits the user’s application system. This
Boot ROM area can be reprogrammed in only parallel I/O mode.
800016
Block 0 : 32Kbyte
User ROM area
4 Kbyte
F00016
FFFF16
FFFF16
Boot ROM area
Notes 1: The Boot ROM area can be rewritten in only parallel input/
output mode.
2: To specify a block, use the maximum address in the block.
Product name
Flash memory
start address
M38859FF
100016
Parallel I/O mode
800016
Block 0 : 32 Kbyte
FFFF16
CPU reprogram mode
User ROM area
4 Kbyte
F00016
FFFF16
Boot ROM area
BSEL = 0
BSEL = 1
User area / Boot area selection bit = 0
User area / Boot area selection bit = 1
Block 1 : 28 Kbyte
100016
100016
Block 1 : 28 Kbyte



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