XE8000EV110 Semtech, XE8000EV110 Datasheet - Page 80

• Manufacturer Part Number: XE8000EV110
• Description: EVAL BOARD FOR XE8802AMI035LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV110

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC02MI035
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Note: Depending on the status of the EnResPConf bit in RegSysCtrl, the reset conditions of the registers are
different. See the reset block documentation for more details on the nresetpconf signal.
12.4 Port B capabilities
Table 12-8 shows the different usages that can be made of the port B with the order of priority. If a pin is selected
to be analog, it overwrites the function and digital set-up. If the pin is not selected as analog, but a function is
enabled, it overwrites the digital set-up. If neither the analog nor function is selected for a pin, it is used as an
ordinary digital I/O. This is the default configuration at start-up.
Note: the presence of the functions is product dependent.
12.5 Port B analog capability
12.5.1
Port B terminals can be attached to a 4 line analog bus by setting the PBAna[x] bits to 1 in the RegPBAna
register.
The other registers then define the connection of these 4 analog lines to the different pads of Port B. These can be
used to implement a simple LCD driver or A/D converter. Analog switching is available only when the circuit is
© Semtech 2006
pos.
pos.
pos.
7 – 0
7 – 0
7 –0
PBOpen[7-0]
PBPullup[7]
PBAna [7-0]
Port B analog configuration
RegPBPullup
RegPBOpen
RegPBAna
Port B
name
PB[7]
PB[6]
PB[5]
PB[4]
PB[3]
PB[2]
PB[1]
PB[0]
r w
r w
r w
rw
rw
rw
(analog)
analog
analog
analog
analog
analog
analog
analog
analog
high
0 nresetpconf
1 nresetpconf
0 nresetpconf
reset
reset
reset
XE8802 Sensing Machine Data Acquisition MCU
Table 12-8: Different Port B functions
PWM1 Counter C (C+D)
PWM0 Counter A (A+B)
Table 12-6: RegPBPullup
Table 12-5: RegPBOpen
Pad PB[7-0] open drain (1 = open
drain)
Pull-up for pad PB[7-0] (1=active)
Set PB[7-0] in analog mode
Table 12-7: RegPBAna
description in digital mode
description in digital mode
description in digital mode
(functions)
clock CPU
medium
uart Rx
usrt S1
usrt S0
uart Tx
16 kHz
utilization (priority)
12-3
with ZoomingADC™ and LCD driver
(digital) (default)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
I/O (with pull-up)
Set PB[7-0] in analog mode
Unused
Connect pad PB[7-0] on selected ana
bus
description in analog mode
description in analog mode
description in analog mode
low
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