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7643 Datasheet(PDF) 297 Page - Renesas Technology Corp

Part # 7643
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  424 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7643 Datasheet(HTML) 297 Page - Renesas Technology Corp

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Rev.2.00
Aug 28, 2006
page 176 of 202
7643 Group
REJ09B0133-0200
APPLICATION
2.8 External device connection
2.8.3 Functional description
This MCU starts its operation in the single-chip mode just after reset.
(1) Memory expansion mode
This mode is selected by setting “01” to the processor mode bits (b1, b0 of CPMA) in software
with CNVSS connected to VSS.
In this mode, the ports function as follows:
Ports P0 and P1 as address buses (AB0 to AB15)
Port P2 as data buses (DB0 to DB7)
______
______
Ports P33 to P37 as DMAOUT,
φOUT, SYNCOUT, WR, RD pins respectively.
This mode enables external memory expansion while maintaining the validity of the internal ROM.
(2) Microprocessor mode
This mode is selected by resetting the MCU with CNVSS connected to VCC, or by setting “10” to
the processor mode bits (b1, b0 of CPMA) in software with CNVSS connected to VSS. The function
is the same as that of memory expansion mode.
In the microprocessor mode, the internal ROM is no longer valid and an external memory must
be used.
Do not set this mode in the flash memory version.



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