Datasheet

DS2155
33 of 238
5. PARALLEL PORT
The SCT is controlled by either a nonmultiplexed (MUX = 0) or a multiplexed (MUX = 1) bus through an
external microcontroller or microprocessor. The SCT can operate with either Intel or Motorola bus timing
configurations. If the BTS pin is connected low, Intel timing is selected; if connected high, Motorola
timing is selected. All Motorola bus signals are listed in parentheses (). See the timing diagrams in AC
Electrical Characteristics in Section 37 for more details.
5.1 Register Map
Table 5-A. Register Map Sorted by Address
ADDRESS
xxh
R/W REGISTER NAME SYMBOL PAGE
00 R/W Master Mode Register MSTRREG 40
01 R/W I/O Configuration Register 1 IOCR1 69
02 R/W I/O Configuration Register 2 IOCR2 70
03 R/W T1 Receive Control Register 1 T1RCR1 46
04 R/W T1 Receive Control Register 2 T1RCR2 47
05 R/W T1 Transmit Control Register 1 T1TCR1 48
06 R/W T1 Transmit Control Register 2 T1TCR2 49
07 R/W T1 Common Control Register 1 T1CCR1 50
08 R/W Software Signaling Insertion Enable 1 SSIE1 93
09 R/W Software Signaling Insertion Enable 2 SSIE2 93
0A R/W Software Signaling Insertion Enable 3 SSIE3 94
0B R/W Software Signaling Insertion Enable 4 SSIE4 94
0C R/W T1 Receive Digital Milliwatt Enable Register 1 T1RDMR1 52
0D R/W T1 Receive Digital Milliwatt Enable Register 2 T1RDMR2 52
0E R/W T1 Receive Digital Milliwatt Enable Register 3 T1RDMR3 52
0F R Device Identification Register IDR 63
10 R/W Information Register 1 INFO1 53
11 R Information Register 2 INFO2 153
12 R/W Information Register 3 INFO3 60
13 — Unused — —
14 R Interrupt Information Register 1 IIR1 42
15 R Interrupt Information Register 2 IIR2 42
16 R/W Status Register 1 SR1 154
17 R/W Interrupt Mask Register 1 IMR1 155
18 R/W Status Register 2 SR2 63
19 R/W Interrupt Mask Register 2 IMR2 64
1A R/W Status Register 3 SR3 65
1B R/W Interrupt Mask Register 3 IMR3 66
1C R/W Status Register 4 SR4 67
1D R/W Interrupt Mask Register 4 IMR4 68
1E R/W Status Register 5 SR5 106
1F R/W Interrupt Mask Register 5 IMR5 106
20 R/W Status Register 6 SR6 135
21 R/W Interrupt Mask Register 6 IMR6 136
22 R/W Status Register 7 SR7 135
23 R/W Interrupt Mask Register 7 IMR7 136
24 R/W Status Register 8 SR8 112