C8051F019-GQ Silicon Laboratories Inc, C8051F019-GQ Datasheet - Page 115
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C8051F019-GQ
Manufacturer Part Number
C8051F019-GQ
Description
IC 8051 MCU 16K FLASH 48TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F018r
Specifications of C8051F019-GQ
Program Memory Type
FLASH
Program Memory Size
16KB (16K x 8)
Package / Case
48-TQFP, 48-VQFP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.8 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F0x
Core
8051
Data Bus Width
8 bit
Data Ram Size
1.25 KB
Interface Type
I2C/SMBus/SPI/UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
16
Number Of Timers
4
Operating Supply Voltage
2.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F005DK
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
No. Of I/o's
16
Ram Memory Size
1.25KB
Cpu Speed
25MHz
No. Of Timers
4
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1198
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F019-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F019-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
16.1.2. Mode 1: 8-Bit UART, Variable Baud Rate
Mode 1 provides standard asynchronous, full duplex communication using a total of 10 bits per data byte: one start
bit, eight data bits (LSB first), and one stop bit (see the timing diagram in Figure 16.4). Data are transmitted from
the TX pin and received at the RX pin (see the interconnection diagram in Figure 16.5). On receive, the eight data
bits are stored in SBUF and the stop bit goes into RB8 (SCON.2).
Data transmission begins when an instruction writes a data byte to the SBUF register. The TI Transmit Interrupt
Flag (SCON.1) is set at the end of the transmission (the beginning of the stop-bit time). Data reception can begin
any time after the REN Receive Enable bit (SCON.4) is set to logic 1. After the stop bit is received, the data byte
will be loaded into the SBUF receive register if the following conditions are met: RI must be logic 0, and if SM2 is
logic 1, the stop bit must be logic 1.
If these conditions are met, the eight bits of data are stored in SBUF, the stop bit is stored in RB8 and the RI flag is
set. If these conditions are not met, SBUF and RB8 will not be loaded and the RI flag will not be set. An interrupt
will occur if enabled when either TI or RI is set.
The baud rate generated in Mode 1 is a function of timer overflow. The UART can use Timer 1 operating in 8-bit
Counter/Timer with Auto-Reload Mode, or Timer 2 operating in Baud Rate Generator Mode to generate the baud
rate (note that the TX and RX clock sources are selected separately). On each timer overflow event (a rollover from
all ones (0xFF for Timer 1, 0xFFFF for Timer 2) to zero), a clock is sent to the baud rate logic.
When Timer 1 is selected as a baud rate source, the SMOD bit (PCON.7) selects whether or not to divide the
Timer 1 overflow rate by two. On reset, the SMOD bit is logic 0, thus selecting the lower speed baud rate by
default. The SMOD bit affects the baud rate generated by Timer 1 as follows:
When Timer 2 is selected as a baud rate source, the baud rate generated by Timer 2 is as follows:
The Timer 1 overflow rate is determined by the Timer 1 clock source (T1CLK) and reload value (TH1). The
frequency of T1CLK can be selected as SYSCLK, SYSCLK/12, or an external clock source. The Timer 1 overflow
rate can be calculated as follows:
For example, assume TMOD = 0x20.
If T1M (CKCON.4) is logic 1, then the above equation becomes:
If T1M (CKCON.4) is logic 0, then the above equation becomes:
115
C8051F018
C8051F019
SPACE
MARK
BIT TIMES
BIT SAMPLING
Mode 1 Baud Rate = (1 / 32) * T1_OVERFLOWRATE (when the SMOD bit is set to logic 0).
Mode 1 Baud Rate = (1 / 16) * T1_OVERFLOWRATE (when the SMOD bit is set to logic 1).
START
BIT
Mode 1 Baud Rate = (1 / 16) * T2_OVERFLOWRATE.
D0
T1_OVERFLOWRATE = (SYSCLK/12) / (256 – TH1).
T1_OVERFLOWRATE = (SYSCLK) / (256 – TH1).
Figure 16.4. UART Mode 1 Timing Diagram
T1_OVERFLOWRATE = T1CLK / (256 – TH1).
D1
D2
Rev. 1.2
D3
D4
D5
D6
D7
STOP
BIT