C8051F130 Silicon Laboratories Inc, C8051F130 Datasheet - Page 239
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C8051F130
Manufacturer Part Number
C8051F130
Description
IC 8051 MCU 128K FLASH 100TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F13xr
Specifications of C8051F130
Core Processor
8051
Core Size
8-Bit
Speed
100MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
64
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
336-1147
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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
ple, to assign TX0 to a Port pin without assigning RX0 as well. Each combination of enabled peripherals
results in a unique device pinout.
All Port pins on Ports 0 through 3 that are not allocated by the Crossbar can be accessed as General-Pur-
pose I/O (GPIO) pins by reading and writing the associated Port Data registers (See SFR Definition 18.4,
SFR Definition 18.6, SFR Definition 18.9, and SFR Definition 18.11), a set of SFR’s which are both byte-
and bit-addressable. The output states of Port pins that are allocated by the Crossbar are controlled by the
digital peripheral that is mapped to those pins. Writes to the Port Data registers (or associated Port bits)
will have no effect on the states of these pins.
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, SETB, and the bitwise MOV write operation). During the read cycle of the read-modify-write instruc-
tion, it is the contents of the Port Data register, not the state of the Port pins themselves, which is read.
Note that at clock rates above 50 MHz, when a pin is written and then immediately read (i.e. a write instruc-
tion followed immediately by a read instruction), the propagation delay of the port drivers may cause the
read instruction to return the previous logic level of the pin.
Because the Crossbar registers affect the pinout of the peripherals of the device, they are typically config-
ured in the initialization code of the system before the peripherals themselves are configured. Once config-
ured, the Crossbar registers are typically left alone.
Once the Crossbar registers have been properly configured, the Crossbar is enabled by setting XBARE
(XBR2.4) to a logic 1. Until XBARE is set to a logic 1, the output drivers on Ports 0 through 3 are
explicitly disabled in order to prevent possible contention on the Port pins while the Crossbar reg-
isters and other registers which can affect the device pinout are being written .
The output drivers on Crossbar-assigned input signals (like RX0, for example) are explicitly disabled; thus
the values of the Port Data registers and the PnMDOUT registers have no effect on the states of these
pins.
18.1.2. Configuring the Output Modes of the Port Pins
The output drivers on Ports 0 through 3 remain disabled until the Crossbar is enabled by setting XBARE
(XBR2.4) to a logic 1.
The output mode of each port pin can be configured to be either Open-Drain or Push-Pull. In the Push-Pull
configuration, writing a logic 0 to the associated bit in the Port Data register will cause the Port pin to be
driven to GND, and writing a logic 1 will cause the Port pin to be driven to V
. In the Open-Drain configu-
DD
ration, writing a logic 0 to the associated bit in the Port Data register will cause the Port pin to be driven to
GND, and a logic 1 will cause the Port pin to assume a high-impedance state. The Open-Drain configura-
tion is useful to prevent contention between devices in systems where the Port pin participates in a shared
interconnection in which multiple outputs are connected to the same physical wire (like the SDA signal on
an SMBus connection).
The output modes of the Port pins on Ports 0 through 3 are determined by the bits in the associated
PnMDOUT registers (See SFR Definition 18.5, SFR Definition 18.8, SFR Definition 18.10, and SFR Defini-
tion 18.12). For example, a logic 1 in P3MDOUT.7 will configure the output mode of P3.7 to Push-Pull; a
logic 0 in P3MDOUT.7 will configure the output mode of P3.7 to Open-Drain. All Port pins default to Open-
Drain output.
Rev. 1.4
239
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