C8051F411EK Silicon Laboratories Inc, C8051F411EK Datasheet - Page 154
![KIT EVAL FOR C8051F411](/photos/9/25/92547/c8051f411ek_sml.jpg)
C8051F411EK
Manufacturer Part Number
C8051F411EK
Description
KIT EVAL FOR C8051F411
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F411EK
Contents
Evaluation Board, CD-ROM, USB Cable, Batteries and User Guide
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F411
Silicon Family Name
C8051F41x
Kit Contents
LCD Based Evaluation Board, USB Cable, Software CD And Quick-Start Guide
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F41x
For Use With
336-1315 - KIT REF DESIGN VOICE RECORD F41X
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1317
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C8051F410/1/2/3
18.3. General Purpose Port I/O
Port pins that remain unassigned by the Crossbar and are not used by analog peripherals can be used for
general purpose I/O. Ports P0-P2 are accessed through corresponding special function registers (SFRs)
that are both byte addressable and bit addressable. When writing to a Port, the value written to the SFR is
latched to maintain the output data value at each pin. When reading, the logic levels of the Port's input pins
are returned regardless of the XBRn settings (i.e., even when the pin is assigned to another signal by the
Crossbar, the Port register can always read its corresponding Port I/O pin). The exception to this is the
execution of the read-modify-write instructions that target a Port Latch register as the destination. The
read-modify-write instructions when operating on a Port SFR are the following: ANL, ORL, XRL, JBC, CPL,
INC, DEC, DJNZ and MOV, CLR or SETB, when the destination is an individual bit in a Port SFR. For
these instructions, the value of the latch register (not the pin) is read, modified, and written back to the
SFR.
In addition to performing general purpose I/O, P0 and P1 can generate a port match event if the logic lev-
els of the Port’s input pins match a software controlled value. A port match event is generated if
(P0 & P0MASK) does not equal (P0MATCH & P0MASK) or if (P1 & P1MASK) does not equal
154
Bit7:
Bit6:
Bit5:
Bit4:
Bit3:
Bits2–0: PCA0ME: PCA Module I/O Enable Bits.
WEAKPUD XBARE
R/W
Bit7
WEAKPUD: Port I/O Weak Pullup Disable.
0: Weak Pullups enabled (except for Ports whose I/O are configured as analog input).
1: Weak Pullups disabled.
XBARE: Crossbar Enable.
0: Crossbar disabled.
1: Crossbar enabled.
T1E: T1 Enable
0: T1 unavailable at Port pin.
1: T1 routed to Port pin.
T0E: T0 Enable
0: T0 unavailable at Port pin.
1: T0 routed to Port pin.
ECIE: PCA0 External Counter Input Enable
0: ECI unavailable at Port pin.
1: ECI routed to Port pin.
000: All PCA I/O unavailable at Port pins.
001: CEX0 routed to Port pin.
010: CEX0, CEX1 routed to Port pins.
011: CEX0, CEX1, CEX2 routed to Port pins.
100: CEX0, CEX1, CEX2, CEX3 routed to Port pins.
101: CEX0, CEX1, CEX2, CEX3, CEX4 routed to Port pins.
110: CEX0, CEX1, CEX2, CEX3, CEX4, CEX5 routed to Port pins.
111: Reserved.
SFR Definition 18.2. XBR1: Port I/O Crossbar Register 1
R/W
Bit6
T1E
R/W
Bit5
T0E
R/W
Bit4
Rev. 1.1
ECIE
R/W
Bit3
R/W
Bit2
PCA0ME
R/W
Bit1
SFR Address:
R/W
Bit0
0xE2
00000000
Reset Value
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