OXCF950 datasheet(22/66 Pages) OXFORD

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OXCF950 rev B DATA SHEET V 1.0

OXFORD SEMICONDUCTOR LTD.

The STSCHG# signal is optional and is not supported on the OXCF950, to reduce the complexity of the device.

Note 2

Audio is not supported on the device.

Note 3

The OXCF950 does not support a specific power down mode, since it is a low power device that features a number of sleep

modes (see Section 6 for further details).

5.5.3

Pin Replacement Register ‘PRR’ (Offset 0xFC)

The Pin Replacement Register is implemented to provide information about READY, WP or the BVD[2..1] status when

implementing the I/O interface.

CBVD1

CBVD2

CREADY

CWProt

RBVD1

RBVD2

RREADY

RWProt

Field

Description

CBVD1

This bit is set (1) when the corresponding bit, RBVD1, changes state. This bit may also be

written by the host.

CBVD2

This bit is set (1) when the corresponding bit, RBVD2, changes state. This bit may also be

written by the host.

CREADY

This bit is set (1) when the corresponding bit, RREADY, changes state. This bit may also be

written by the host.

CWProt

This bit is set (1) when the corresponding bit, RWProt, changes state. This bit may also be

written by the host.

RBVD1

When read, this bit represents the internal state of the Battery Voltage Detect circuits which

would be on the BVD1 pin.

When this bit is written as 1 the corresponding CBVD1 bit is also written. When this bit is

written as 0, the CBVD1 bit is unaffected.

RBVD2

When read, this bit represents the internal state of the Battery Voltage Detect circuits which

would be on the BVD2 pin.

When this bit is written as 1 the corresponding CBVD2 bit is also written. When this bit is

written as 0, the CBVD2 bit is unaffected.

RREADY

When read, this bit represents the internal state of the READY signal. This bit may also be

used to determine the state of READY as that pin has been relocated for use as Interrupt

Request on IO Cards.

When this bit is written as 1 the corresponding “changed” bit is also written. When this bit is

written as 0, the “changed” bit is unaffected.

RWProt

When read, this bit represents the state of the WP signal. This signal may also be used to

determine the state of the Write Protect switch when pin 33 is being used for IOIS16#.

When this bit is written as 1 the corresponding “changed” bit is also written. When this bit is

written as 0, the “changed” bit is unaffected.

Table 19: Pin Replacement Register

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