C8051F712-GQ Silicon Laboratories Inc, C8051F712-GQ Datasheet - Page 278
![IC 8051 MCU 8K FLASH 48-TQFP](/photos/12/16/121695/c8051f712-gq_sml.jpg)
C8051F712-GQ
Manufacturer Part Number
C8051F712-GQ
Description
IC 8051 MCU 8K FLASH 48-TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F71xr
Specifications of C8051F712-GQ
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Cap Sense, POR, PWM, Temp Sensor, WDT
Number Of I /o
39
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Eeprom Size
32 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-TQFP, 48-VQFP
Processor Series
C8051F7x
Core
8051
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
I2C, SMBus, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
39
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F700DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 16 Channel
Package
48TQFP
Device Core
8051
Family Name
C8051F71x
Maximum Speed
25 MHz
Operating Supply Voltage
1.8|3 V
For Use With
336-1635 - DEV KIT FOR C8051F700
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
336-1644
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F712-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F712-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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C8051F70x/71x
33.3. Timer 3
Timer 3 is a 16-bit timer formed by two 8-bit SFRs: TMR3L (low byte) and TMR3H (high byte). Timer 3 may
operate in 16-bit auto-reload mode or (split) 8-bit auto-reload mode. The T3SPLIT bit (TMR3CN.3) defines
the Timer 3 operation mode.
Timer 3 may be clocked by the system clock, the system clock divided by 12, or the external oscillator
source divided by 8. The external clock mode is ideal for real-time clock (RTC) functionality, where the
internal high-frequency oscillator drives the system clock while Timer 3 is clocked by an external oscillator
source. The external oscillator source divided by 8 is synchronized with the system clock when in all oper-
ating modes except suspend. When the internal oscillator is placed in suspend mode, The external clock/8
signal can directly drive the timer. This allows the use of an external clock to wake up the device from sus-
pend mode. The timer will continue to run in suspend mode and count up. When the timer overflow occurs,
the device will wake from suspend mode, and begin executing code again. The timer value may be set
prior to entering suspend, to overflow in the desired amount of time (number of clocks) to wake the device.
If a wake-up source other than the timer wakes the device from suspend mode, it may take up to three
timer clocks before the timer registers can be read or written. During this time, the STSYNC bit in register
OSCICN will be set to 1, to indicate that it is not safe to read or write the timer registers.
33.3.1. 16-bit Timer with Auto-Reload
When T3SPLIT (TMR3CN.3) is zero, Timer 3 operates as a 16-bit timer with auto-reload. Timer 3 can be
clocked by SYSCLK, SYSCLK divided by 12, or the external oscillator clock source divided by 8. As the
16-bit timer register increments and overflows from 0xFFFF to 0x0000, the 16-bit value in the Timer 3
reload registers (TMR3RLH and TMR3RLL) is loaded into the Timer 3 register as shown in Figure 33.7,
and the Timer 3 High Byte Overflow Flag (TMR3CN.7) is set. If Timer 3 interrupts are enabled (if EIE1.7 is
set), an interrupt will be generated on each Timer 3 overflow. Additionally, if Timer 3 interrupts are enabled
and the TF3LEN bit is set (TMR3CN.5), an interrupt will be generated each time the lower 8 bits (TMR3L)
overflow from 0xFF to 0x00.
278
External Clock / 8
SYSCLK / 12
T3XCLK
0
1
SYSCLK
Figure 33.7. Timer 3 16-Bit Mode Block Diagram
M
H
T
3
M
T
3
L
0
1
CKCON
M
T
2
H
T
M
2
L
TR3
M
T
1
M
T
0
S
C
A
1
S
C
A
0
TCLK
Rev. 1.0
TMR3RLL TMR3RLH
TMR3L
TMR3H
Reload
To ADC
TF3CEN
T3SPLIT
TF3LEN
T3XCLK
TF3H
TF3L
TR3
Interrupt
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