C8051F047R Silicon Labs, C8051F047R Datasheet - Page 298

• Manufacturer Part Number: C8051F047R
• Description: 8-bit Microcontrollers - MCU 25 MIPS 32KB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F047R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 4.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 13
• Data Rom Size: 64 KB
• Interface Type: CAN, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

C8051F040/1/2/3/4/5/6/7
23.2.2. Capture Mode
In Capture Mode, Timer n will operate as a 16-bit counter/timer with capture facility. When the Timer Exter-
nal Enable bit (found in the TMRnCN register) is set to ‘1’, a high-to-low transition on the TnEX input pin
causes the 16-bit value in the associated timer (TMRnH, TMRnL) to be loaded into the capture registers
(RCAPnH, RCAPnL). If a capture is triggered in the counter/timer, the Timer External Flag (TMRnCN.6)
will be set to ‘1’ and an interrupt will occur if the interrupt is enabled. See
dler” on page 153
As the 16-bit timer register increments and overflows TMRnH:TMRnL, the TFn Timer Overflow/Underflow
Flag (TMRnCN.7) is set to ‘1’ and an interrupt will occur if the interrupt is enabled. The timer can be config-
ured to count down by setting the Decrement Enable Bit (TMRnCF.0) to ‘1’. This will cause the timer to
decrement with every timer clock/count event and underflow when the timer transitions from 0x0000 to
0xFFFF. Just as in overflows, the Overflow/Underflow Flag (TFn) will be set to ‘1’, and an interrupt will
occur if enabled.
Counter/Timer with Capture mode is selected by setting the Capture/Reload Select bit CP/RLn
(TMRnCN.0) and the Timer n Run Control bit TRn (TMRnCN.2) to logic 1. The Timer n respective External
Enable EXENn (TMRnCN.3) must also be set to logic 1 to enable captures. If EXENn is cleared, transi-
tions on TnEX will be ignored.
296
External Clock
SYSCLK
(XTAL1)
Tn
TnE
X
Crossbar
8
2
12
Crossbar
for further information concerning the configuration of interrupt sources.
EXENn
Figure 23.4. Tn Capture Mode Block Diagram
TRn
0
1
TMRnCF
M
T
n
1
M
T
n
0
T
O
G
n
Rev. 1.5
O
T
n
E
TCLK
D
C
E
N
RCAPnL
TMRnL
0xFF
RCAPnH
TMRnH
0xFF
Toggle Logic
Section “12.3. Interrupt Han-
CP/RLn
EXENn
EXFn
C/Tn
TRn
TFn
0
1
Interrupt
(Port Pin)
Tn