Datasheet

ADuC7060/ADuC7061 Data Sheet
Rev. D | Page 84 of 108
UART Status Register 1
COMSTA1 Register
Name: COMSTA1
Address: 0xFFFF0718
Default value: 0x00
Access: Read only
Function: COMSTA1 is a modem status register.
Table 93. COMSTA1 MMR Bit Designations
Bit Name Description
7:5 Reserved. Not used.
4 CTS Clear to send.
3:1 Reserved. Not used.
0 DCTS Delta CTS.
Set automatically if CTS changed state since
COMSTA1 was last read.
Cleared automatically by reading COMSTA1.
UART Interrupt Enable Register 0
COMIEN0 Register
Name: COMIEN0
Address: 0xFFFF0704
Default value: 0x00
Access: Read and write
Function: This 8-bit register enables and disables the
individual UART interrupt sources.
Table 94. COMIEN0 MMR Bit Designations
Bit Name Description
7:4 Reserved. Not used.
3 EDSSI Modem status interrupt enable bit.
Set by user to enable generation of an
interrupt if any of COMSTA0[3:1] are set.
Cleared by user.
2 ELSI Receive status interrupt enable bit.
Set by user to enable generation of an
interrupt if any of the COMSTA0[3:1] register
bits are set.
Cleared by user.
1 ETBEI Enable transmit buffer empty interrupt.
Set by user to enable an interrupt when the
buffer is empty during a transmission; that is,
when COMSTA0[5] is set.
Cleared by user.
0 ERBFI Enable receive buffer full interrupt.
Set by user to enable an interrupt when the
buffer is full during a reception.
Cleared by user.
UART Interrupt Identification Register 0
COMIID0 Register
Name: COMIID0
Address: 0xFFFF0708
Default value: 0x01
Access: Read only
Function: This 8-bit register reflects the source of the
UART interrupt.