XE8806A SEMTECH [Semtech Corporation], XE8806A Datasheet - Page 71

• Manufacturer Part Number: XE8806A
• Description: Ultra Low-Power Low-Voltage
• Manufacturer: SEMTECH [Semtech Corporation]

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 individually to four internal analog lines (4 line analog bus)
• Two internal freq. (16 kHz and cpuck) can be output on PB[2] and PB[3]
Product dependant:
• Two PWM signal can be output on 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 behavior, all pins can be used for analog
signals. Each port terminal can be individually selected as digital input or output or as analog for sharing one of four
possible analog lines.
12.3 Register map
Table 12-1 shows the Port B registers.
© Semtech 2006
Table 12-1: Default Port B registers
RegPBOut
RegPBIn
RegPBDir
RegPBOpen
RegPBPullup
RegPBAna
register name
12-2
XE8806A/XE8807A
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