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M16C/62 Scheda tecnica(PDF) 559 Page - Renesas Technology Corp

Il numero della parte M16C/62
Spiegazioni elettronici  16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES
PDF  615 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M16C/62 Scheda tecnica(HTML) 559 Page - Renesas Technology Corp

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External Buses
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
2-242
4.6 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.
(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 4.5.1. Example of releasing the external bus



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