M16C65 Datasheet, PDF (194/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
11. Bus
Note
Do not use bus control pins for the 80-pin package.
11. Bus
11.1 Introduction
Two types of buses are available:
• Internal bus in the MCU
• External bus which is used to access to external devices in memory expansion mode or
microprocessor mode
Table 11.1 Bus Specifications
Item
Internal bus
External bus
Specification
• Used in all processor modes
• Separate bus
• 16-bit data bus width
• 0 to 2 software waits can be inserted
• Used in memory expansion mode or microprocessor mode
• Separate bus or multiplexed bus selectable
• Data bus width selectable (8 or 16 bits)
• Number of address buses selectable (12, 16, or 20 buses)
• 4 chip select outputs CS0 to CS3
• Combinations of read and write signals selectable (RD, BHE, WR or RD, WRL, WRH)
• RDY available
• HOLD, HDLA available
• 0 to 8 software waits can be inserted
• Memory area expansion function (up to 4 Mbytes) (Refer to 12. “Memory Space
Expansion Function”)
• 3 V or 5 V interface
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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