C8051F045R Silicon Labs, C8051F045R Datasheet - Page 156
![no-image](/images/no-image-200.jpg)
C8051F045R
Manufacturer Part Number
C8051F045R
Description
8-bit Microcontrollers - MCU 25 MIPS 64KB 10ADC
Manufacturer
Silicon Labs
Datasheet
1.C8051F044R.pdf
(328 pages)
Specifications of C8051F045R
Product Category
8-bit Microcontrollers - MCU
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
64 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
- Current page: 156 of 328
- Download datasheet (2Mb)
C8051F040/1/2/3/4/5/6/7
12.3.3. Interrupt Priorities
Each interrupt source can be individually programmed to one of two priority levels: low or high. A low prior-
ity interrupt service routine can be preempted by a high priority interrupt. A high priority interrupt cannot be
preempted. Each interrupt has an associated interrupt priority bit in an SFR (IP-EIP2) used to configure its
priority level. Low priority is the default. If two interrupts are recognized simultaneously, the interrupt with
the higher priority is serviced first. If both interrupts have the same priority level, a fixed priority order is
used to arbitrate, given in Table 12.4.
12.3.4. Interrupt Latency
Interrupt response time depends on the state of the CPU when the interrupt occurs. Pending interrupts are
sampled and priority decoded each system clock cycle. The fastest possible response time is 5 system
clock cycles: 1 clock cycle to detect the interrupt and 4 clock cycles to complete the LCALL to the ISR. If
an interrupt is pending when a RETI is executed, a single instruction is executed before an LCALL is made
to service the pending interrupt. Therefore, the slowest response time for an interrupt (when no other inter-
rupt is currently being serviced or the new interrupt is of greater priority) occurs when the CPU is perform-
ing an RETI instruction followed by a DIV as the next instruction. In this case, the response time is
18 system clock cycles: 1 clock cycle to detect the interrupt, 5 clock cycles to execute the RETI, 8 clock
cycles to complete the DIV instruction and 4 clock cycles to execute the LCALL to the ISR. If the CPU is
executing an ISR for an interrupt with equal or higher priority, the new interrupt will not be serviced until the
current ISR completes, including the RETI and following instruction.
12.3.5. Interrupt Register Descriptions
The SFRs used to enable the interrupt sources and set their priority level are described below. Refer to the
datasheet section associated with a particular on-chip peripheral for information regarding valid interrupt
conditions for the peripheral and the behavior of its interrupt-pending flag(s).
156
Rev. 1.5
Related parts for C8051F045R
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![CP2102EK](/photos/9/3/90395/cp2102ek_tmb.jpg)
Part Number:
Description:
KIT EVALUATION FOR CP2102
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![CP2103EK](/photos/9/6/90669/cp2103ek_tmb.jpg)
Part Number:
Description:
KIT EVAL FOR CP2103 USB TO UART
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![CP2201EK](/photos/9/9/90977/cp2201ek_tmb.jpg)
Part Number:
Description:
KIT EVAL FOR CP2201 ETH CTRLR
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![CAPTOUCHSENSEDC](/photos/9/20/92001/captouchsensedc_tmb.jpg)
Part Number:
Description:
DAUGHTER CARD CAP TOUCH SENSE
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![CAPTOUCHSENSESK](/photos/9/20/92002/captouchsensesk_tmb.jpg)
Part Number:
Description:
KIT STARTER CAP TOUCH SENSE
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F320DK](/photos/9/20/92068/c8051f320dk_tmb.jpg)
Part Number:
Description:
DEV KIT FOR C8051F320/F321
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F120DK](/photos/9/20/92070/c8051f120dk_tmb.jpg)
Part Number:
Description:
DEVKIT-F120/21/22/23/24/25/26/27
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F310DK](/photos/9/23/92300/c8051f310dk_tmb.jpg)
Part Number:
Description:
DEV KIT FOR C8051F310/F311
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F226DK](/photos/9/23/92302/c8051f226dk_tmb.jpg)
Part Number:
Description:
DEV KIT F220/221/226/230/231/236
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F300DK](/photos/9/23/92305/c8051f300dk_tmb.jpg)
Part Number:
Description:
DEV KIT F300/301/302/303/304/305
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F330DK](/photos/9/23/92306/c8051f330dk_tmb.jpg)
Part Number:
Description:
DEV KIT FOR C8051F330/F331
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F005DK](/photos/9/23/92307/c8051f005dk_tmb.jpg)
Part Number:
Description:
DEV KIT FOR F005/006/007
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F020DK](/photos/9/23/92314/c8051f020dk_tmb.jpg)
Part Number:
Description:
DEV KIT FOR F020/F021/F022/F023
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F340DK](/photos/9/23/92323/c8051f340dk_tmb.jpg)
Part Number:
Description:
KIT DEV FOR C8051F34X
Manufacturer:
Silicon Laboratories Inc
Datasheet:
![C8051F410DK](/photos/9/23/92324/c8051f410dk_tmb.jpg)
Part Number:
Description:
KIT DEV FOR C8051F41X
Manufacturer:
Silicon Laboratories Inc
Datasheet: