C8051F332-GMR Silicon Laboratories Inc, C8051F332-GMR Datasheet - Page 150
C8051F332-GMR
Manufacturer Part Number
C8051F332-GMR
Description
IC 8051 MCU 4K FLASH 20MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F33xr
Specifications of C8051F332-GMR
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-QFN
For Use With
336-1451 - ADAPTER PROGRAM TOOLSTICK F330
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
C8051F332-GMR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
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C8051F330/1/2/3/4/5
16.1. 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 16.2), 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
ter/Timer with Auto-Reload” on page 179
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 16.1-A
and Equation 16.1-B.
Where T1
value). Timer 1 clock frequency is selected as described in
reference for typical baud rates and system clock frequencies is given in Table 16.1 through Table 16.6.
Note that the internal oscillator may still generate the system clock when the external oscillator is driving
Timer 1.
154
CLK
is the frequency of the clock supplied to Timer 1, and T1H is the high byte of Timer 1 (reload
Detected
Start
A)
B)
Figure 16.2. UART0 Baud Rate Logic
UartBaudRate
T1_Overflow_Rate
RX Timer
Equation 16.1. UART0 Baud Rate
Timer 1
TH1
TL1
). The Timer 1 reload value should be set so that overflows will
=
Overflow
Overflow
Rev. 1.7
1
-- -
2
=
T1_Overflow_Rate
------------------------- -
256 TH1
T1
–
Section “18. Timers” on page 177
CLK
2
2
Section “18.1.3. Mode 2: 8-bit Coun-
UART
RX Clock
TX Clock
. A quick
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