sc68c752b NXP Semiconductors, sc68c752b Datasheet - Page 20

• Manufacturer Part Number: sc68c752b
• Description: 5 V, 3.3 V And 2.5 V Dual Uart, 5 Mbit/s Max. , With 64-byte Fifos And Motorola Up Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Register descriptions
SC68C752B_3
Product data sheet
Each register is selected using address lines A0, A1, A2, and in some cases, bits from
other registers. The programming combinations for register selection are shown in
Table
Table 10:
[1]
[2]
[3]
[4]
[5]
[6]
A2
0
0
0
0
1
1
1
1
0
0
0
1
1
1
1
1
1
1
Fig 13. Crystal oscillator connections
MCR[7] can only be modified when EFR[4] is set.
Accessed by a combination of address pins and register bits.
Accessible only when LCR[7] is logic 1.
Accessible only when LCR is set to 1011 1111 (BFh).
Accessible only when EFR[4] = 1 and MCR[6] = 1, that is, EFR[4] and MCR[6] are read/write enables.
Accessible only when CS = 0, MCR[2] = 1, and loopback is disabled (MCR[4] = 0).
10.
A1
0
0
1
1
0
0
1
1
0
0
1
0
0
1
1
1
1
1
Register map - read/write properties
A0
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
1
1
Read mode
Receive Holding Register (RHR)
Interrupt Enable Register (IER)
Interrupt Identification Register (IIR)
Line Control Register (LCR)
Modem Control Register (MCR)
Line Status Register (LSR)
Modem Status Register (MSR)
ScratchPad Register (SPR)
Divisor Latch LSB (DLL)
Divisor Latch MSB (DLH)
Enhanced Feature Register (EFR)
Xon1 word
Xon2 word
Xoff1 word
Xoff2 word
Transmission Control Register (TCR)
Trigger Level Register (TLR)
FIFO ready register
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
Rev. 03 — 29 November 2005
XTAL1
1.8432 MHz
C1
22 pF
[2] [4]
[2] [4]
[2] [4]
[2] [4]
X1
XTAL2
[2] [6]
C2
33 pF
[2] [3]
[2] [3]
[2] [5]
[1]
[2] [4]
XTAL1
[2] [5]
1.8432 MHz
C1
22 pF
Write mode
Transmit Holding Register (THR)
Interrupt Enable Register
FIFO Control Register (FCR)
Line Control Register
Modem Control Register
ScratchPad Register
divisor latch LSB
divisor latch MSB
Enhanced Feature Register
Xon1 word
Xon2 word
Xoff1 word
Xoff2 word
Transmission Control Register
Trigger Level Register
X1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
XTAL2
002aaa870
1.5 k
C2
47 pF
SC68C752B
[2] [4]
[2] [4]
[2] [4]
[2] [4]
[2] [3]
[2] [3]
[2] [5]
[1]
[2] [4]
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[2] [5]