C8051F34C-GQ Silicon Laboratories Inc, C8051F34C-GQ Datasheet - Page 206
C8051F34C-GQ
Manufacturer Part Number
C8051F34C-GQ
Description
IC 8051 MCU 64K FLASH 48TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F34xr
Specifications of C8051F34C-GQ
Program Memory Type
FLASH
Program Memory Size
64KB (64K x 8)
Package / Case
48-TQFP, 48-VQFP
Core Processor
8051
Core Size
8-Bit
Speed
48MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
40
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.25 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F3x
Core
8051
Data Ram Size
256 KB
Interface Type
UART
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
40
Number Of Timers
4
Operating Supply Voltage
2.7 V to 5.25 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
KSK-SL-F34X, KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F340DK
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Part Number:
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Manufacturer:
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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
18.1. Enhanced Baud Rate Generation
The UART0 baud rate is generated by Timer 1 in 8-bit auto-reload mode. The TX clock is generated by
TL1; the RX clock is generated by a copy of TL1 (shown as RX Timer in Figure 18.2), which is not
user-accessible. Both TX and RX Timer overflows are divided by two to generate the TX and RX baud
rates. The RX Timer runs when Timer 1 is enabled, and uses the same reload value (TH1). However, an
RX Timer reload is forced when a START condition is detected on the RX pin. This allows a receive to
begin any time a START is detected, independent of the TX Timer state.
Timer 1 should be configured for Mode 2, 8-bit auto-reload (see
Timer with Auto-Reload” on page 237
occur at two times the desired UART baud rate frequency. Note that Timer 1 may be clocked by one of six
sources: SYSCLK, SYSCLK / 4, SYSCLK / 12, SYSCLK / 48, the external oscillator clock / 8, or an exter-
nal input T1. For any given Timer 1 clock source, the UART0 baud rate is determined by Equation 18.1.
Where T1
value). Timer 1 clock frequency is selected as described in
reference for typical baud rates using the internal oscillator is given in Table 18.1. Note that the internal
oscillator may still generate the system clock if an external oscillator is driving Timer 1.
18.2. Operational Modes
UART0 provides standard asynchronous, full duplex communication. The UART mode (8-bit or 9-bit) is
selected by the S0MODE bit (SCON0.7). Typical UART connection options are shown below.
206
CLK
is the frequency of the clock supplied to Timer 1, and T1H is the high byte of Timer 1 (reload
Detected
Start
Figure 18.2. UART0 Baud Rate Logic
RX Timer
Equation 18.1. UART0 Baud Rate
UartBaudRate
Timer 1
TH1
TL1
). The Timer 1 reload value should be set so that overflows will
Overflow
Overflow
Rev. 1.3
=
------------------------------ -
256 T1H
T1
–
Section “21. Timers” on page 235
CLK
Section “21.1.3. Mode 2: 8-bit Counter/
2
2
UART
1
-- -
2
RX Clock
TX Clock
. A quick
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