C8051F018-GQR Silicon Laboratories Inc, C8051F018-GQR Datasheet - Page 121

• Manufacturer Part Number: C8051F018-GQR
• Description: IC 8051 MCU 16K FLASH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F018r

Specifications of C8051F018-GQR

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: 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: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.8 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: C8051F0x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 4 bit
• Operating Supply Voltage: 2.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F005DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

17. TIMERS
Each MCU implements four counter/timers: three are 16-bit counter/timers compatible with those found in the
standard 8051, and one is a 16-bit timer for use with the ADC, SMBus, or for general purpose use. These 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 offers additional capabilities not available
in Timers 0 and 1. Timer 3 is similar to Timer 2, but without the capture or Baud Rate Generator modes.
When functioning as a timer, the counter/timer registers are incremented on each clock tick. Clock ticks are derived
from the system clock divided by either one or twelve as specified by the Timer Clock Select bits (T2M-T0M) in
CKCON. The twelve-clocks-per-tick option provides compatibility with the older generation of the 8051 family.
Applications that require a faster timer can use the one-clock-per-tick option.
When functioning as a counter, a counter/timer register is incremented on each high-to-low transition at the selected
input pin for T0, T1, or T2. Events with a frequency of up to one-fourth the system clock’s frequency can be
counted. The input signal need not be periodic, but it should be held at a given level for at least two full system
clock cycles to ensure the level is sampled.
17.1.
Timer 0 and Timer 1 are accessed and controlled through SFRs. Each counter/timer is implemented as a 16-bit
register accessed as two separate bytes: a low byte (TL0 or TL1) and a high byte (TH0 or TH1).
Counter/Timer Control (TCON) register is used to enable Timer 0 and Timer 1 as well as indicate their status. Both
counter/timers operate in one of four primary modes selected by setting the Mode Select bits M1-M0 in the
Counter/Timer Mode (TMOD) register. Each timer can be configured independently. Following is a detailed
description of each operating mode.
17.1.1. Mode 0: 13-bit Counter/Timer
Timer 0 and Timer 1 operate as a 13-bit counter/timer in Mode 0. The following describes the configuration and
operation of Timer 0. However, both timers operate identically and Timer 1 is configured in the same manner as
described for Timer 0.
The TH0 register holds the eight MSBs of the 13-bit counter/timer. TL0 holds the five LSBs in bit positions TL0.4-
TL0.0. The three upper bits of TL0 (TL0.7-TL0.5) are indeterminate and should be masked out or ignored when
reading. As the 13-bit timer register increments and overflows from 0x1FFF (all ones) to 0x0000, the timer
overflow flag TF0 (TCON.5) is set and an interrupt will occur if enabled.
The C/T0 bit (TMOD.2) selects the counter/timer’s clock source. Clearing C/T selects the system clock as the input
for the timer. When C/T0 is set to logic 1, high-to-low transitions at the selected input pin increment the timer
register. (Refer to Port I/O Section 13.1 for information on selecting and configuring external I/O pins.)
121
Timer 0 and Timer 1:
13-bit counter/timer
16-bit counter/timer
8-bit counter/timer with auto-reload
Two 8-bit counter/timers (Timer 0 only)
C8051F018
C8051F019
Timer 0 and Timer 1
Timer 2:
16-bit counter/timer with auto-reload
16-bit counter/timer with capture
Baud rate generator
Rev. 1.2
Timer 3:
16-bit timer with auto-reload
The