C8051F124TB Silicon Laboratories Inc, C8051F124TB Datasheet - Page 238
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C8051F124TB
Manufacturer Part Number
C8051F124TB
Description
MCU, MPU & DSP Development Tools With C8051F124 MCU
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F120DK.pdf
(350 pages)
Specifications of C8051F124TB
Processor To Be Evaluated
C8051F12x and C8051F13x
Interface Type
USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
18.1. Ports 0 through 3 and the Priority Crossbar Decoder
The Priority Crossbar Decoder, or “Crossbar”, allocates and assigns Port pins on Port 0 through Port 3 to
the digital peripherals (UARTs, SMBus, PCA, Timers, etc.) on the device using a priority order. The Port
pins are allocated in order starting with P0.0 and continue through P3.7 if necessary. The digital peripher-
als are assigned Port pins in a priority order which is listed in Figure 18.3, with UART0 having the highest
priority and CNVSTR2 having the lowest priority.
18.1.1. Crossbar Pin Assignment and Allocation
The Crossbar assigns Port pins to a peripheral if the corresponding enable bits of the peripheral are set to
a logic 1 in the Crossbar configuration registers XBR0, XBR1, and XBR2, shown in SFR Definition 18.1,
SFR Definition 18.2, and SFR Definition 18.3. For example, if the UART0EN bit (XBR0.2) is set to a
logic 1, the TX0 and RX0 pins will be mapped to P0.0 and P0.1 respectively.
Because UART0 has the highest priority, its pins will always be mapped to P0.0 and P0.1 when UART0EN
is set to a logic 1. If a digital peripheral’s enable bits are not set to a logic 1, then its ports are not accessi-
ble at the Port pins of the device. Also note that the Crossbar assigns pins to all associated functions when
a serial communication peripheral is selected (i.e. SMBus, SPI, UART). It would be impossible, for exam-
238
TX0
RX0
SCK
MISO
MOSI
NSS
SDA
SCL
TX1
RX1
CEX0
CEX1
CEX2
CEX3
CEX4
CEX5
ECI
CP0
CP1
T0
/INT0
T1
/INT1
T2
T2EX
T4
T4EX
/SYSCLK
CNVSTR0
CNVSTR2
PIN I/O 0
Figure 18.3. Priority Crossbar Decode Table (EMIFLE = 0; P1MDIN = 0xFF)
●
●
●
●
●
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● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
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●
●
●
●
1
●
●
● ● ● ● ●
● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ●
●
2
●
●
● ● ● ● ●
● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ●
●
3
P0
●
● ● ● ● ● ● ● ● ●
●
4
●
● ● ● ● ● ● ● ● ●
●
5
● ● ● ● ● ● ● ● ●
6
NSS is not assigned to a port pin when the SPI is placed in 3-wire mode
● ● ● ● ● ● ● ● ●
7
0
AIN2 Inputs/Non-muxed Addr H
1
2
3
P1
4
5
6
7
Muxed Addr H/Non-muxed Addr L
0
Rev. 1.4
1
2
3
P2
4
5
6
7
0
Muxed Data/Non-muxed Data
1
2
3
P3
4
5
6
7
Crossbar Register Bits
UART0EN:
UART1EN:
CNVSTE0: XBR2.0
CNVSTE2: XBR2.5
SMB0EN:
PCA0ME:
SYSCKE: XBR1.7
SPI0EN:
T2EXE: XBR1.6
T4EXE: XBR2.4
ECI0E: XBR0.6
INT0E: XBR1.2
INT1E: XBR1.4
CP0E: XBR0.7
CP1E: XBR1.0
T0E: XBR1.1
T1E: XBR1.3
T2E: XBR1.5
T4E: XBR2.3
XBR0.2
XBR0.1
XBR0.0
XBR2.2
XBR0.[5:3]
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