C8051F127 Silicon Laboratories Inc, C8051F127 Datasheet - Page 300
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C8051F127
Manufacturer Part Number
C8051F127
Description
IC 8051 MCU 128K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F12xr
Specifications of C8051F127
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
32
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
8.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x10b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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C8051F130/1/2/3
22.1. Enhanced Baud Rate Generation
The UART1 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 22.2), 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 311
occur at two times the desired baud rate. Note that Timer 1 may be clocked by one of five sources: SYS-
CLK, SYSCLK / 4, SYSCLK / 12, SYSCLK / 48, or the external oscillator clock / 8. For any given Timer 1
clock source, the UART1 baud rate is determined by Equation 22.1.
Where T1
value). Timer 1 clock frequency is selected as described in
page 309
through Table 22.5. Note that the internal oscillator or PLL may still generate the system clock when the
external oscillator is driving Timer 1 (see
details).
300
. A quick reference for typical baud rates and system clock frequencies is given in Table 22.1
CLK
is the frequency of the clock supplied to Timer 1, and T1H is the high byte of Timer 1 (reload
Detected
Start
Figure 22.2. UART1 Baud Rate Logic
RX Timer
Equation 22.1. UART1 Baud Rate
UARTBaudRate
Timer 1
TH1
TL1
). The Timer 1 reload value should be set so that overflows will
Section “23.1. Timer 0 and Timer 1” on page 309
Overflow
Overflow
Rev. 1.4
=
------------------------------ -
256 T1H
T1
–
CLK
Section “23.1. Timer 0 and Timer 1” on
Section “23.1.3. Mode 2: 8-bit Counter/
2
2
UART1
1
-- -
2
RX Clock
TX Clock
for more
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