C8051F046 Silicon Laboratories Inc, C8051F046 Datasheet - Page 266
C8051F046
Manufacturer Part Number
C8051F046
Description
IC 8051 MCU 32K FLASH 100TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F04xr
Specifications of C8051F046
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
CAN, 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
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 13x10b
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
336-1158
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C8051F040/1/2/3/4/5/6/7
21.1. UART0 Operational Modes
UART0 provides four operating modes (one synchronous and three asynchronous) selected by setting
configuration bits in the SCON0 register. These four modes offer different baud rates and communication
protocols. The four modes are summarized in Table 21.1.
21.1.1. Mode 0: Synchronous Mode
Mode 0 provides synchronous, half-duplex communication. Serial data is transmitted and received on the
RX0 pin. The TX0 pin provides the shift clock for both transmit and receive. The MCU must be the master
since it generates the shift clock for transmission in both directions (see the interconnect diagram in
Figure 21.3).
Data transmission begins when an instruction writes a data byte to the SBUF0 register. Eight data bits are
transferred LSB first (see the timing diagram in Figure 21.2), and the TI0 Transmit Interrupt Flag
(SCON0.1) is set at the end of the eighth bit time. Data reception begins when the REN0 Receive Enable
bit (SCON0.4) is set to logic 1 and the RI0 Receive Interrupt Flag (SCON0.0) is cleared. One cycle after
the eighth bit is shifted in, the RI0 flag is set and reception stops until software clears the RI0 bit. An inter-
rupt will occur if enabled when either TI0 or RI0 are set.
The Mode 0 baud rate is SYSCLK/12. RX0 is forced to open-drain in Mode 0, and an external pullup will
typically be required.
266
Mode
0
1
2
3
Synchronization
Asynchronous
Asynchronous
Asynchronous
Synchronous
RX (data out)
RX (data in)
TX (clk out)
TX (clk out)
Figure 21.2. UART0 Mode 0 Timing Diagram
C8051Fxxx
Table 21.1. UART0 Modes
SYSCLK / 32 or SYSCLK / 64
Timer 1, 2, 3, or 4 Overflow
Timer 1, 2, 3, or 4 Overflow
D0
RX
TX
D0
D1
SYSCLK / 12
Baud Clock
D1
Rev. 1.5
MODE 0 TRANSMIT
MODE 0 RECEIVE
D2
D2
D3
CLK
DATA
D3
D4
8 Extra Outputs
D4
D5
D5
Data Bits
Reg.
Shift
D6
8
8
9
9
D6
D7
D7
Start/Stop Bits
1 Start, 1 Stop
1 Start, 1 Stop
1 Start, 1 Stop
None
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