c8051t623-g Silicon Laboratories, c8051t623-g Datasheet - Page 100
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c8051t623-g
Manufacturer Part Number
c8051t623-g
Description
Full Speed Usb Eprom Mcu Family
Manufacturer
Silicon Laboratories
Datasheet
1.C8051T623-G.pdf
(247 pages)
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SFR Definition 17.3. XBR2: Port I/O Crossbar Register 2
SFR Address = 0xE3
17.5. Port Match
Port match functionality allows system events to be triggered by a logic value change on P0 or P1. A soft-
ware controlled value stored in the PnMATCH registers specifies the expected or normal logic values of P0
and P1. A Port mismatch event occurs if the logic levels of the Port’s input pins no longer match the soft-
ware controlled value. This allows Software to be notified if a certain change or pattern occurs on P0 or P1
input pins regardless of the XBRn settings.
The PnMASK registers can be used to individually select which P0 and P1 pins should be compared
against the PnMATCH registers. A Port mismatch event is generated if (P0 & P0MASK) does not equal
(P0MATCH & P0MASK) or if (P1 & P1MASK) does not equal (P1MATCH & P1MASK).
A Port mismatch event may be used to generate an interrupt or wake the device from a low power mode,
such as IDLE or SUSPEND. See the Interrupts and Power Options chapters for more details on interrupt
and wake-up sources.
Name
Reset
Bit
7:1
Type
0
Bit
Unused
URT1E
Name
R
7
0
Unused. Read = 0000000b; Write = Don’t Care.
UART1 I/O Output Enable Bit.
0: UART1 I/O unavailable at Port pins.
1: UART1 TX1, RX1 routed to Port pins.
R
6
0
R
5
0
C8051T622/3 and C8051T326/7
Rev. 1.1
R
4
0
Function
R
3
0
R
2
0
R
1
0
URT1E
R/W
0
0
107
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