C8051F930DK Silicon Laboratories Inc, C8051F930DK Datasheet - Page 278

• Manufacturer Part Number: C8051F930DK
• Description: KIT DEV C8051F920,F921,F930,F931
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F930DK

• Contents: Target Board, Power Adapter, USB Debug Adapter, Cables, Batteries, and Software
• Processor To Be Evaluated: C8051F930
• Processor Series: C8051F9xx
• Data Bus Width: 8 bit
• Interface Type: I2C, UART, SPI
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 0.9 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F920, F921, F930, F931
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1473

C8051F93x-C8051F92x
25. Timers
Each MCU includes four counter/timers: two are 16-bit counter/timers compatible with those found in the
standard 8051, and two are 16-bit auto-reload timer for use with the ADC, SMBus, or for general purpose
use. These timers can be used to measure time intervals, count external events and generate periodic
interrupt requests. Timer 0 and Timer 1 are nearly identical and have four primary modes of operation.
Timer 2 and Timer 3 offer 16-bit and split 8-bit timer functionality with auto-reload. Additionally, Timer 2 and
Timer 3 have a Capture Mode that can be used to measure the SmaRTClock or a Comparator period with
respect to another oscillator. This is particularly useful when using Capacitive Touch Switches. See Appli-
cation Note AN338 for details on Capacitive Touch Switch sensing.
Timers 0 and 1 may be clocked by one of five sources, determined by the Timer Mode Select bits (T1M –
T0M) and the Clock Scale bits (SCA1–SCA0). The Clock Scale bits define a pre-scaled clock from which
Timer 0 and/or Timer 1 may be clocked (See SFR Definition 25.1 for pre-scaled clock selection).
Timer 0/1 may then be configured to use this pre-scaled clock signal or the system clock. Timer 2 and
Timer 3 may be clocked by the system clock, the system clock divided by 12. Timer 2 may additionally be
clocked by the SmaRTClock divided by 8 or the Comparator0 output. Timer 3 may additionally be clocked
by the external oscillator clock source divided by 8 or the Comparator1 output.
Timer 0 and Timer 1 may also be operated as counters. When functioning as a counter, a counter/timer
register is incremented on each high-to-low transition at the selected input pin (T0 or T1). Events with a fre-
quency of up to one-fourth the system clock frequency can be counted. The input signal need not be peri-
odic, but it should be held at a given level for at least two full system clock cycles to ensure the level is
properly sampled.
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Two 8-bit counter/timers (Timer 0
Timer 0 and Timer 1 Modes:
8-bit counter/timer with auto-
13-bit counter/timer
16-bit counter/timer
reload
only)
Two 8-bit timers with auto-reload
16-bit timer with auto-reload
Timer 2 Modes:
Rev. 1.1
Two 8-bit timers with auto-reload
16-bit timer with auto-reload
Timer 3 Modes: