SB16C1054_Data Sheet_EN

SB16C1054
QUAD UART WITH 256-BYTE FIFO
FEBRUARY 2009 REV 1.0
5
24
Table 7: Internal Registers Map…continued
Address
A[2:0]
Register Read/Write Comments
Page 0 Registers
0h THR : Transmit Holding Register
RBR : Receive Buffer Register
Write-only
Read-only
LCR[7] = 0, MCR[6] = 0
1h IER : Interrupt Enable Register Read/Write LCR[7] = 0, MCR[6] = 0
2h FCR : FIFO Control Register
ISR : Interrupt Status Register
Write-only
Read-only
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
3h LCR : Line Control Register Read/Write —
4h MCR : Modem Control Register Read/Write LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh,
LCR[7] = 0, MCR[6] = 1
5h LSR : Line Status Register Read-only LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
6h MSR : Modem Status Register Read-only LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
7h SPR : Scratch Pad Register Read/Write LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
Page 1 Registers
0h DLL : Divisor Latch LSB Read/Write
LCR[7] = 1, LCR ≠ BFh
1h DLM : Divisor Latch MSB Read/Write
LCR[7] = 1, LCR ≠ BFh
2h FCR : FIFO Control Register
ISR : Interrupt Status Register
Write-only
Read-only
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
3h LCR : Line Control Register Read/Write —
4h MCR : Modem Control Register Read/Write LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh,
LCR[7] = 0, MCR[6] = 1
5h LSR : Line Status Register Read-only LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
6h MSR : Modem Status Register Read-only LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
7h SPR : Scratch Pad Register Read/Write LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh