SX8801IRXXMLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8801IRXXMLTRT' PDF : 135 Pages View PDF
XE8801A – SX8801R
12.1 Features
• Input / output / analog port, 8 bits wide
• Each bit can be set individually for input or output
• Each bit can be set individually for open-drain or push-pull
• Each bit can be set individually for pull-up or not (for input or open-drain mode)
• In open-drain mode, pull-up is not active when corresponding pad is set to zero
• The 8 pads can be connected by pairs to four internal analog lines (4 line analog bus)
• Two internal freq. (cpuck and 32 kHz) can be output on PB[2] and PB[3]
Product dependant:
• Two PWM signals can be outputted on the pads PB[0] and PB[1]
• The synchronous serial interface (USRT) uses pads PB[5], PB[4]
• The UART interface uses pads PB[6] and PB[7] for Tx and Rx
12.2 Overview
Port B is a multi-purpose 8 bit Input/output port. In addition to digital functions, all pins can be used for analog
signals. All port terminals can be selected by pairs as digital input or output or as analog sharing one of four
possible analog lines.
12.3 Register map
Pos. RegPBOut
7 – 0 PBOut[7-0]
rw
reset
r w 0 resetpconf
description in digital mode
description in analog mode
Pad PB[7-0] output value
Analog bus selection for pad PB[7-0]
Table 12-1: RegPBOut
Pos.
RegPBIn
rw
7 – 0 PBIn[7-0]
rw
reset
description in digital mode
Pad PB[7-0] input status
Table 12-2: RegPBIn
description in analog mode
Unused
Pos.
RegPBDir
7 – 0 PBDir [7-0]
rw
reset
r w 0 resetpconf
description in digital mode
description in analog mode
Pad PB[7-0] direction (0=input)
Analog bus selection for pad PB[7-0]
Table 12-3: RegPBDir
Pos. RegPBOpen
7 – 0 PBOpen[7-0]
rw
reset
r w 0 resetpconf
description in digital mode
description in analog mode
Pad PB[7-0] open drain (1 = open Unused
drain)
Table 12-4: RegPBOpen
Pos. RegPBPullup rw
reset
7 –0 PBPullup[7]
r w 0 resetpconf
description in digital mode
Pull-up for pad PB[7-0] (1=active)
description in analog mode
Connect pad PB[7-0] on selected ana
bus
Table 12-5: RegPBPullup
© Semtech 2005
12-2
www.semtech.com
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