C8051F045 View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
C8051F045 Datasheet PDF : 328 Pages
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C8051F040/1/2/3/4/5/6/7
SFR Definition 17.14. P3MDIN: Port3 Input Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
11111111
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address: 0xAF
SFR Page: F
Bits7-0:
P1MDIN.[7:0]: Port 3 Input Mode Bits.
0: Port Pin is configured in Analog Input mode. The digital input path is disabled (a read from
the Port bit will always return ‘0’). The weak pullup on the pin is disabled.
1: Port Pin is configured in Digital Input mode. A read from the Port bit will return the logic
level at the Pin. The state of the weak pullup is determined by the WEAKPUD bit (XBR2.7,
see SFR Definition 17.3).
SFR Definition 17.15. P3MDOUT: Port3 Output Mode
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bits7-0: P2MDOUT.[7:0]: Port3 Output Mode Bits.
0: Port Pin output mode is configured as Open-Drain.
1: Port Pin output mode is configured as Push-Pull.
R/W
R/W
Reset Value
00000000
Bit1
Bit0
SFR Address: 0xA7
SFR Page: F
17.2. Ports 4 through 7
On C8051F040/2/4/6 devices, all Port pins on Ports 4 through 7 can be accessed as General-Purpose I/O
(GPIO) pins by reading and writing the associated Port Data registers (See SFR Definition 17.16, SFR
Definition 17.18, SFR Definition 17.20, and SFR Definition 17.22 located on SFR Page F), a set of SFRs
which are both bit and byte-addressable.
A Read of a Port Data register (or Port bit) will always return the logic state present at the pin itself, regard-
less of whether the Crossbar has allocated the pin for peripheral use or not. An exception to this occurs
during the execution of a read-modify-write instruction (ANL, ORL, XRL, CPL, INC, DEC, DJNZ, JBC,
CLR, SET, and the bitwise MOV operation). During the read cycle of the read-modify-write instruction, it is
the contents of the Port Data register, not the state of the Port pins themselves, which is read.
220
Rev. 1.5
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