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XR16M890
REV. 1.0.0
UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
2.0 UART INTERNAL REGISTERS
The complete register set for the M890 is shown in Table 6 and Table 7 .
T ABLE 6: UART INTERNAL REGISTERS
A2 A1 A0
R EGISTER
R EAD /W RITE
C OMMENTS
16C550 C OMPATIBLE R EGISTERS
0
0
0
0
0
0
0
0
0 0
0 1
0 0
0 1
1 0
0 0
0 1
1 0
DREV - Device Revision
DVID - Device Identification Register
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
Read-only
Read-only
Read/Write
Read/Write
Read/Write
Read-only
Write-only
Read/Write
Read-only
Write-only
LCR[7] = 1, LCR ≠ 0xBF,
DLL = 0x00, DLM = 0x00
LCR[7] = 1, LCR ≠ 0xBF
See DLD[7:6]
LCR[7] = 1, LCR ≠ 0xBF, EFR[4] = 1
LCR[7] = 0
LCR[7] = 0 if EFR[4] = 1
or
LCR ≠ 0xBF if EFR[4] = 0
0
1
1 1
0 0
LCR - Line Control Register
MCR - Modem Control Register
Read/Write
Read/Write
1
1
1
1
0 1
0 1
1 0
1 0
LSR - Line Status Register
SHR - Setup/Hysteresis Register
MSR - Modem Status Register
SFR - Special Function Register
Read-only
Write-only
Read-only
Write-only
LCR ≠ 0xBF
LCR ≠ 0xBF
EFR[4] = 1
1
1 1
SPR - Scratch Pad Register
Read/Write
LCR ≠ 0xBF, FCTR[6] = 0,
SFR[0] = 0
1
1
1 1
1 1
EMSR - Enhanced Mode Select Register
FC - RX/TX FIFO Level Counter Register
Write-only
Read-only
LCR ≠ 0xBF, FCTR[6] = 1,
SFR[0] = 0
E NHANCED R EGISTERS
0
0 0
FC - RX/TX FIFO Level Counter Register
Read-only
0
0
0
1
1
1
1
1
1
1
1
0 0
0 1
1 0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
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
Write-only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
LCR = 0xBF
LCR = 0xBF
SFR[0]=0
LCR = 0xBF
SFR[0]=1
27
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