PC87365 datasheet(146/215 Pages) NSC

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8.0 ACCESS.bus Interface (ACB) (Continued)

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8.3

ACB REGISTERS

The following abbreviations are used to indicate the Register Type:

• R/W = Read/Write.

• R = Read from a speciﬁc address returns the value of a speciﬁc register. Write to the same address is to a different

• W = Write.

• RO = Read Only.

• R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.

8.3.1

ACB Register Map

8.3.2

ACB Serial Data Register (ACBSDA)

This shift register is used to transmit and receive data. The most significant bit is transmitted (received) first and the least

significant bit is transmitted (received) last. Reading or writing to the ACBSDA register is allowed only when the SDAST bit

of the ACBST register is set or for repeated starts after setting the START bit. An attempt to access this register under other

conditions may produce unpredictable results.

Location:

Offset 00h

Type:

R/W

Offset Mnemonic

Type

Section

00h

ACBSDA

ACB Serial Data

R/W

8.3.2

01h

ACBST

ACB Status

Varies per bit

8.3.3

02h

ACBCST

ACB Control Status

Varies per bit

8.3.4

03h

ACBCTL1

ACB Control 1

R/W

8.3.5

04h

ACBADDR ACB Own Address

R/W

8.3.6

05h

ACBCTL2

ACB Control 2

R/W

8.3.7

Bit

76543210

Name

ACB Serial Data

Reset

PC87365 Datasheet(PDF) 146 Page - National Semiconductor (TI)

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