IN16C1054
Table 7: Internal Registers Map…continued
Address
A[2:0]
Register
Read/Write
Comments
Page 0 Registers
0h
THR : Transmit Holding Register
Write-only
LCR[7] = 0, MCR[6] = 0
RBR : Receive Buffer Register
IER : Interrupt Enable Register
Read-only
Read/Write
1h
2h
LCR[7] = 0, MCR[6] = 0
LCR[7] = 0, MCR[6] = 0,
FCR : FIFO Control Register
Write-only
ISR : Interrupt Status Register
LCR : Line Control Register
Read-only
Read/Write
LCR[7] = 1, LCR ≠ BFh
3h
4h
—
MCR : Modem Control Register
Read/Write
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh,
LCR[7] = 0, MCR[6] = 1
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
5h
6h
7h
LSR : Line Status Register
MSR : Modem Status Register
SPR : Scratch Pad Register
Read-only
Read-only
Read/Write
Page 1 Registers
0h
1h
Read/Write
Read/Write
DLL : Divisor Latch LSB
DLM : Divisor Latch MSB
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 0, MCR[6] = 0,
2h
FCR : FIFO Control Register
Write-only
ISR : Interrupt Status Register
LCR : Line Control Register
Read-only
Read/Write
LCR[7] = 1, LCR ≠ BFh
3h
4h
—
MCR : Modem Control Register
Read/Write
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh,
LCR[7] = 0, MCR[6] = 1
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
LCR[7] = 0, MCR[6] = 0,
LCR[7] = 1, LCR ≠ BFh
5h
6h
7h
LSR : Line Status Register
MSR : Modem Status Register
SPR : Scratch Pad Register
Read-only
Read-only
Read/Write
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
