USER'S GUIDE

RPC CONTROL REGISTER ± RPCTL (ADDRESS 0D8H) Figure 12±6

RNR

±

EXBS

AE

IBI

DMA

RPCON

RG0

Bit Description:

RPCTL.3:

IBI

 

When using the RPC mode, an interrupt may be required for the Input Buffer

 

Flag. This interrupt is enabled by setting the Input Buffer Interrupt (IBI) bit.

 

At this time, the timer 1 interrupt is disabled, and this RPC mode interrupt

 

is used in its place (vector location 1BH). This bit can be set only when the

 

RPCON bit is set.

Initialization:

Cleared on all resets, and when the RPCON bit is cleared.

Read Access:

Can be read at any time.

Write Access:

Can be written when RPC mode is enabled (RPCON=1).

RPCTL.2:

DMA

 

This bit is set to enable DMA transfers when RPC mode is invoked. It can

 

only be set when RPCON=1.

Initialization:

Cleared on all resets, and when the RPC is cleared.

Read Access:

Can be read at any time.

Write Access:

Can be written when RPC mode is enabled (RPCON=1).

RPCTL.1:

RPCON

 

Enable the 8042 I/O protocol. When set, Port 0 becomes the data bus, and

 

Port 2 becomes the control signals as shown in Figure 12±3.

Initialization:

Cleared on all resets.

Read Access:

Can be read at any time.

Write Access:

Can be written at any time.

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Mitsubishi DS907x SIP RPC Control Register ± Rpctl Address 0D8H ±6, RNR Exbs IBI DMA Rpcon RG0, Rpcon bit is set, 104