Maxim Integrated Secure Microcontroller - Manual (Page 108)

Secure Microcontroller User’s Guide
108 of 187
RPC Control Register—RPCTL (0D8H)
RNR — EXBS AE IBI DMA RPCON RG0
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 12-6 .
Initialization: Cleared on all resets.
Read Access: Can be read at any time.
Write Access: Can be written at any time.