C8051F045 데이터 시트보기 (PDF) - Silicon Laboratories
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C8051F045 Datasheet PDF : 328 Pages
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C8051F040/1/2/3/4/5/6/7
1.6. Controller Area Network
The C8051F04x family of devices feature a Controller Area Network (CAN) controller that implements
serial communication using the CAN protocol. The CAN controller facilitates communication on a CAN net-
work in accordance with the Bosch specification 2.0A (basic CAN) and 2.0B (full CAN). The CAN controller
consists of a CAN Core, Message RAM (separate from the C8051 RAM), a message handler state
machine, and control registers.
The CAN controller can operate at bit rates up to 1 Mbit/second. Silicon Labs CAN has 32 message
objects each having its own identifier mask used for acceptance filtering of received messages. Incoming
data, message objects and identifier masks are stored in the CAN message RAM. All protocol functions for
transmission of data and acceptance filtering is performed by the CAN controller and not by the C8051
MCU. In this way, minimal CPU bandwidth is used for CAN communication. The C8051 configures the
CAN controller, accesses received data, and passes data for transmission via Special Function Registers
(SFR) in the C8051.
CANTX
CANRX
C8051F04x
CAN Controller
S
TX
RX
CAN
CAN_CLK
Y
BRP
S
Prescaler
(fsys)
C
L
Core
K
Message RAM
(32 Message Objects)
REGISTERS
CIP-51
MCU
S
F
R
's
Message Handler
Interrupt
Figure 1.11. CAN Controller Diagram
1.7. Serial Ports
The C8051F04x MCU Family includes two Enhanced Full-Duplex UARTs, an enhanced SPI Bus, and
SMBus/I2C. Each of the serial buses is fully implemented in hardware and makes extensive use of the
CIP-51's interrupts, thus requiring very little intervention by the CPU. The serial buses do not "share"
resources such as timers, interrupts, or Port I/O, so any or all of the serial buses may be used together with
any other.
Rev. 1.5
31
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