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M30620ECFS Scheda tecnica(PDF) 556 Page - Renesas Technology Corp

Il numero della parte M30620ECFS
Spiegazioni elettronici  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
PDF  621 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M30620ECFS Scheda tecnica(HTML) 556 Page - Renesas Technology Corp

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External Buses
Mitsubishi microcomputers
M16C / 62 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
541
5.7 Precautions for External Bus
(1) The external ROM version can operate only in the microprocessor mode, so be sure to per-
form the following:
• Connect the CNVSS pin to Vcc.
• Fix the processor mode bits (b1 and b0) to “112”.
(1) An “L” level is input to the HOLD pin.
(2) HOLD is detected.
(3) The CPU releases the bus.
(4) An “L” is output to the HLDA pin.
(5) An “H” is input to the HOLD pin.
(6) An “H” is output to the HLDA pin.
(7) The CPU not releases the bus.
(8) The CPU resumes using the bus.
BCLK
DBi
HOLD
HLDA
ALE
ADi
(1) (2) (3) (4)
(5)(6) (7)
Bus released
(8)
Indeterminate
HiZ
HiZ
HiZ
HiZ
CSn
RD/WR
Figure 5.6.1. Example of releasing the external bus



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