HFC-Smini Cologne Chip AG, HFC-Smini Datasheet - Page 8

• Manufacturer Part Number: HFC-Smini
• Manufacturer: Cologne Chip AG

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1.3
The HFC-S mini has an integrated 8-bit microprocessor interface which can be configured into Motorola
bus, de-multiplexed Intel bus and multiplexed Intel bus. The different interface modes are selected during
power on by ALE.
Mode 2:
Mode 3:
Mode 4:
In mode 4 all internal registers can be directly accessed. In mode 2 and mode 3 first the address of the
desired register must be written to the address with A0 = '1'. Afterwards data can be read/written from/to
that register by reading/writing the address with A0 = '0'.
In mode 4 A0 must be '0'.
Processor interface modes
Motorola bus with control signals /CS, R/W, /DS is selected by setting ALE to VDD.
Intel bus with seperated address bus (A0) and data bus (D[7:0]) and control signals /CS,
/WR, /RD is selected by setting ALE to GND.
Intel bus with multiplexed address bus and data bus with control signals /CS, /WR, /RD,
ALE. ALE must be '0' during power on to select this mode. A0 must be '0'.
ALE latches the address. The multiplexed address/data bus is D[7:0].
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