Motorola MVME1X7P manual Transmit Interrupt Registers, Modem Interrupt Registers, DMA Registers

1

Programming Issues

Table 1-9. Cirrus Logic CD2401 Serial Port Memory Map (Continued)

Base Address = $FFF45000

Register Description	Register	Offsets	Size	Access
	Name
Receive Interrupt Status Register low	RISRl	89	B	R
Receive Interrupt Status Register high	RISRh	88	B	R
Receive FIFO Output Count	RFOC	30	B	R
Receive Data Register	RDR	F8	B	R
Receive End Of Interrupt Register	REOIR	84	B	W
Transmit Interrupt Registers
Transmit Priority Interrupt Level Register	TPILR	E0	B	R/W
Transmit Interrupt Register	TIR	EC	B	R
Transmit Interrupt Status Register	TISR	8A	B	R
Transmit FIFO Transfer Count	TFTC	80	B	R
Transmit Data Register	TDR	F8	B	W
Transmit End Of Interrupt Register	TEOIR	85	B	W
Modem Interrupt Registers
Modem Priority Interrupt Level Register	MPILR	E3	B	R/W
Modem Interrupt Register	MIR	EF	B	R
Modem (/Timer) Interrupt Status Register	MISR	8B	B	R
Modem End Of Interrupt Register	MEOIR	86	B	W
DMA Registers
DMA Mode Register (write only)	DMR	F6	B	W
Bus Error Retry Count	BERCNT	8E	B	R/W
DMA Buffer Status	DMABSTS	19	B	R
DMA Receive Registers
A Receive Buffer Address Lower	ARBADRL	42	W	R/W
A Receive Buffer Address Upper	ARBADRU	40	W	R/W
B Receive Buffer Address Lower	BRBADRL	46	W	R/W
B Receive Buffer Address Upper	BRBADRU	44	W	R/W
A Receive Buffer Byte Count	ARBCNT	4A	W	R/W

1-38 Computer Group Literature Center Web Site