xr20m1280 Exar Corporation, xr20m1280 Datasheet - Page 27

• Manufacturer Part Number: xr20m1280
• Description: I2c/spi Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

REV. P1.1.1
The complete register set for the M1280 is shown in
2.0 UART INTERNAL REGISTERS
A2 A1 A0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0 0
0 0
0 1
1 0
0 1
1 0
1 1
0 0
0 1
0 1
1 0
1 0
1 1
1 1
1 1
0 0
0 0
0 1
1 0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
DREV - Device Revision
DLL - Divisor LSB Register
DLM - Divisor MSB Register
DLD - Divisor Fractional Register
RHR - Receive Holding Register
THR - Transmit Holding Register
IER - Interrupt Enable Register
ISR - Interrupt Status Register
FCR - FIFO Control Register
LCR - Line Control Register
MCR - Modem Control Register
LSR - Line Status Register
SHR - Setup/Hysteresis Register
MSR - Modem Status Register
SFR - Special Function Register
SPR - Scratch Pad Register
EMSR - Enhanced Mode Select Register
FC - RX/TX FIFO Level Counter Register
FC - RX/TX FIFO Level Counter Register
TRIG - RX/TX FIFO Trigger Level Register
FCTR - Feature Control Register
EFR - Enhanced Function Register
Xon-1 - Xon Character 1
Xon-2 - Xon Character 2
Xoff-1 - Xoff Character 1
Xoff-2 - Xoff Character 2
GPIOINT - GPIO Interrupt Enable Register
GPIO3T - GPIO Three-State Control Register
GPIOINV - GPIO Polarity Control Register
GPIOSEL - GPIO Select Register
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
T
ABLE
R
EGISTER
9: UART INTERNAL REGISTERS
16C550 C
E
NHANCED
PRELIMINARY
OMPATIBLE
Table 9
27
R
EGISTERS
R
and
EGISTERS
Table
R
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Write-only
Write-only
Write-only
Write-only
Write-only
Write-only
EAD
10.
/W
RITE
LCR ≠ 0xBF if EFR[4] = 0
LCR ≠ 0xBF, FCTR[6] = 0
LCR ≠ 0xBF, FCTR[6] = 1
DLL = 0x00, DLM = 0x00
LCR[7] = 1, LCR ≠ 0xBF,
LCR[7] = 1, LCR ≠ 0xBF,
LCR[7] = 1, LCR ≠ 0xBF
LCR[7] = 0 if EFR[4] = 1
See DLD[7:6]
LCR = 0xBF
LCR = 0xBF
LCR = 0xBF
LCR ≠ 0xBF
LCR ≠ 0xBF
C
EFR[4] = 1
LCR[7] = 0
EFR[4] = 1
SFR[0]=0
SFR[0]=1
XR20M1280
OMMENTS
or