C8051F020DK Silicon Laboratories Inc, C8051F020DK Datasheet - Page 240

• Manufacturer Part Number: C8051F020DK
• Description: DEV KIT FOR F020/F021/F022/F023
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F020DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F02x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F020
• Silicon Family Name: C8051F02x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051 F020/021/022/023
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1200

C8051F020/1/2/3
22.2. Timer 3
Timer 3 is a 16-bit timer formed by the two 8-bit SFRs, TMR3L (low byte) and TMR3H (high byte). Timer 3 may be
clocked by the external oscillator source (divided by eight) or the system clock (divided by either one or twelve as
specified by the Timer 3 Clock Select bit T3M in the Timer 3 Control Register TMR3CN). Timer 3 is always config-
ured as an auto-reload timer, with the reload value held in the TMR3RLL (low byte) and TMR3RLH (high byte) reg-
isters.
The Timer 3 external clock source feature offers a real-time clock (RTC) mode. When bit T3XCLK (TMR3CN.0) is
set to logic 1, Timer 3 is clocked by the external oscillator input (divided by 8) regardless of the system clock selec-
tion. This split clock domain allows Timer 3 to be clocked by a precision external source while the system clock is
derived from the high-speed internal oscillator. When T3XCLK is logic 0, the Timer 3 clock source is specified by bit
T3M (TMR3CN.1).
Timer 3 can also be used to start an ADC Data Conversion, for SMBus timing (see Section
AGEMENT BUS / I2C BUS
ter mode.
240
Oscillator Source
SYSCLK
External
8
12
T3M
0
1
(SMBUS0)” on page 183), or as a general-purpose timer. Timer 3 does not have a coun-
(from SMBus)
Figure 22.19. Timer 3 Block Diagram
SCL
T3XCLK
Crossbar
1
0
TOE
TR3
Rev. 1.4
Reload
TCLK
TMR3RLL TMR3RLH
TMR3L
TMR3H
“18. SYSTEM MAN-
T3XCLK
T3M
TF3
TR3
(to ADC)
Interrupt