
161
Bit 4—Enable of
EXDTCE Output to P74 (P74DTCOE): Selects whether or not the EXDTCE
signal, indicating that DTC transfer corresponding to EXIRQ0—F input is in progress, is output to
P74. This signal is used, for example, when the DTC in the chip has been activated by an interrupt
(EXIRQ0 to EXIRQF) from an external module, and the interrupt request is to be cleared
automatically on the external module side by DTC transfer.
Bit 4
P74DTCOE
Description
0
EXDTCE is not output to P74
(Initial value)
1
EXDTCE is output to P74
Bits 3 to 0—Reserved: These bits will return an undefined value if read, and should only be
written with 0.
6.11.3
Module Stop Control Register B (MSTPCRB)
7
MSTPB7
1
R/W
6
MSTPB6
1
R/W
5
MSTPB5
1
R/W
4
MSTPB4
1
R/W
3
MSTPB3
1
R/W
0
MSTPB0
1
R/W
2
MSTPB2
1
R/W
1
MSTPB1
1
R/W
Bit
Initial value
R/W
:
MSTPCRB is an 8-bit readable/writable register that performs module stop mode control.
When the MSTPB0 bit is set to 1, the external module expansion function stops operation at the
end of the bus cycle, and enters module stop mode. For details, see section 17.5, Module Stop
Mode.
MSTPCRB is initialized to H'FF by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 0—Module Stop (MSTPB0): Specifies the external module expansion function module stop
mode.
Bit 0
MSTPB0
Description
0
External module expansion function module stop mode is cleared
1
External module expansion function module stop mode is set
(Initial value)