NS16C2552TVA NSC [National Semiconductor], NS16C2552TVA Datasheet - Page 11

• Manufacturer Part Number: NS16C2552TVA
• Description: Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
• Manufacturer: NSC [National Semiconductor]

Default
Default
Default
Default
Default
Default
XOFF1
Default
XOFF2
Default
A2-A0
DREV
XON1
XON2
Addr
DLM
6.0 Register Set
Reg
AFR
EFR
DLL
0x0
0x1
0x2
0x0
0x2
0x4
0x5
0x6
0x7
The Nomenclature of register descriptions:
• Register name, address, register bit, and value example:
• ‘b - binary number.
• ‘h - hex number.
• 0xNN - hex number.
FCR 0x2.7:6 = 2’b11 - bits 6 and 7 of FCR are both 1.
Alternative description: FCR[7:6] = 2’b11.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RD/
WR
R
XOFF1 XOFF1 XOFF1
XOFF2 XOFF2 XOFF2
Legend
XON1
XON2
Rsrvd
BIT 7
DLM
Bit 7
Bit 7
Bit 7
Bit 7
Auto
CTS
Bit 7
Bit 7
Bit 7
Bit 7
DLL
Ena
ID
X
X
0
0
0
0
0
0
Default
XON1
XON2
Rsrvd
Name
BIT 6
Value
Bit 6
DLM
Bit 6
Bit 6
Bit 6
Auto
Bit 6
Bit 6
Bit 6
Bit 6
RTS
DLL
Ena
(Continued)
Bit
ID
X
X
0
0
0
0
0
0
TABLE 2. NS16C2552 Register Summary (Continued)
Special
Rsrvd
XON1
XON2
BIT 5
Bit 5
DLM
Bit 5
Bit 5
Bit 5
Char
Bit 5
Bit 5
Bit 5
Bit 5
DLL
Sel
ID
X
X
0
0
0
0
0
0
MCR[7:5]
FCR[5:4]
IER[7:4]
IIR[5:4]
XOFF1
XOFF2
Rsrvd
XON1
XON2
BIT 4
Bit 4
DLM
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Baud Rate Generator Divisor
DLL
ID
X
X
0
0
0
0
0
0
Enhanced Registers
Control
XOFF1 XOFF1
XOFF2 XOFF2
DREV
Rsrvd RXRDY
XON1
XON2
BIT 3
Bit 3
DLM
Bit 3
Bit 3
Bit 3
Flow
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
DLL
SW
X
X
0
0
0
0
0
0
11
Control
DREV
XON1
XON2
BIT 2
DLM
Flow
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
6.1 RECEIVE BUFFER REGISTER (RBR)
The receiver section contains an 8-bit Receive Shift Register
(RSR) and a 16 (or 64)-byte FIFO that can be accessed
through Receive Buffer Register (RBR).
DLL
• n’bN - n is the number of bits; N is the bit value. Example
SW
Sel
X
X
0
0
0
0
0
0
8’b01010111 = 8’h57 = 0x57.
Control Bit 1
BAUDOUT
SW Flow
XOFF1
XOFF2
DREV
XON1
XON2
BIT 1
DLM
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
DLL
Sel
X
X
0
0
0
0
0
0
current
Control
XOFF1
XOFF2
DREV
XON1
XON2
BIT 0
Con-
Bit 0
DLM
Bit 0
Bit 0
Flow
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
DLL
WR
SW
X
X
0
0
0
0
0
0
LCR != 0xBF
LCR = 0xBF
DLM = 0x00
LCR ! 0xBF
DLL = 0x00
LCR[7] = 1
LCR[7] = 1
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