C8051F040-TB Silicon Laboratories Inc, C8051F040-TB Datasheet - Page 222

• Manufacturer Part Number: C8051F040-TB
• Description: BOARD PROTOTYPING W/C8051F040
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F040-TB

• Contents: Board
• Processor To Be Evaluated: C8051F04x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F040
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F040/1/2/3/4/5/6/7
222
Bits7-0:
Bits7-0:
P4.7
R/W
R/W
Bit7
Bit7
P4.[7:0]: Port4 Output Latch Bits.
Write - Output appears on I/O pins.
0: Logic Low Output.
1: Logic High Output (Open-Drain if corresponding P4MDOUT.n bit = 0). See SFR Definition
17.17.
Read - Returns states of I/O pins.
0: P4.n pin is logic low.
1: P4.n pin is logic high.
Note: P4.7 (/WR), P4.6 (/RD), and P4.5 (ALE) can be driven by the External Data Memory
Interface. See
page 187
P4MDOUT.[7:0]: Port4 Output Mode Bits.
0: Port Pin output mode is configured as Open-Drain.
1: Port Pin output mode is configured as Push-Pull.
P4.6
R/W
R/W
Bit6
Bit6
SFR Definition 17.17. P4MDOUT: Port4 Output Mode
for more information.
Section “16. External Data Memory Interface and On-Chip XRAM” on
P4.5
R/W
R/W
Bit5
Bit5
SFR Definition 17.16. P4: Port4 Data
P4.4
R/W
R/W
Bit4
Bit4
Rev. 1.5
P4.3
R/W
R/W
Bit3
Bit3
P4.2
R/W
R/W
Bit2
Bit2
P4.1
R/W
R/W
Bit1
Bit1
SFR Address:
SFR Address:
SFR Page:
SFR Page:
P4.0
R/W
R/W
Bit0
Bit0
0xC8
F
0x9C
F
Addressable
Reset Value
00000000
Reset Value
11111111
Bit