C8051F226-TB Silicon Laboratories Inc, C8051F226-TB Datasheet - Page 105

• Manufacturer Part Number: C8051F226-TB
• Description: BOARD PROTOTYPING W/C8051F226
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F226-TB

• Contents: Board
• Processor To Be Evaluated: C8051F22x and C8051F23x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F226
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

14.2. General Purpose Port I/O
Each I/O port is accessed through a corresponding special function register (SFR) that is both byte
addressable and bit addressable. When writing to a port, the value written to the SFR is latched to main-
tain the output data value at each pin. When reading, the logic levels of the port’s input pins are returned
regardless of the PRTnMX settings (i.e., even when the pin is assigned to another signal by the MUX, the
Port Register can always still read its corresponding Port I/O pin), provided its pin is configured for digital
input mode. The exception to this is the execution of the read-modify-write instructions. 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 instruc-
tions, the value of the register (not the pin) is read, modified, and written back to the SFR.
Bits7–0: P0.[7:0]
Bits7–0: PRT0CF.[7:0]: Output Configuration Bits for P0.7–P0.0 (respectively)
P0.7
R/W
Bit7
R/W
Bit7
(Write - Output appears on I/O pins per PRT0MX, PRT1MX, and PRT2MX Registers)
0: Logic Low Output.
1: Logic High Output (high impedance if corresponding PRT0CF.n bit = 0)
(Read - Regardless of PRT0MX, PRT1MX, and PRT2MX Register settings).
0: P0.n pin is logic low.
1: P0.n pin is logic high.
0: Corresponding P0.n Output mode is Open-Drain.
1: Corresponding P0.n Output mode is Push-Pull.
P0.6
SFR Definition 14.5. PRT0CF: Port0 Configuration Register
R/W
Bit6
R/W
Bit6
P0.5
R/W
Bit5
R/W
SFR Definition 14.4. P0: Port0 Register
Bit5
P0.4
R/W
Bit4
R/W
Bit4
P0.3
R/W
Bit3
Rev. 1.6
R/W
Bit3
P0.2
R/W
Bit2
R/W
Bit2
P0.1
R/W
Bit1
R/W
Bit1
(bit addressable)
C8051F2xx
P0.0
R/W
Bit0
R/W
Bit0
SFR Address:
SFR Address:
Reset Value
Reset Value
00000000
11111111
0x80
0xA4
105