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參數(shù)資料
| 型號： | SJA1000 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Stand-alone CAN controller(單機CAN控制器) |
| 中文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 49/68頁 |
| 文件大?。?/td> | 234K |
| 代理商： | SJA1000 |
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2000 Jan 04
49
Philips Semiconductors
Product specification
Stand-alone CAN controller
SJA1000
6.4.16
RX M
ESSAGE
C
OUNTER
(RMC)
The RMC register (CAN address 29) reflects the number of messages available within the RXFIFO. The value is
incremented with each receive event and decremented by the release receive buffer command. After any reset event,
this register is cleared.
Table 42
Bit interpretation of the RX message counter (RMC); CAN address 29
Note
1.
This bit cannot be written. During read-out of this register always a zero is given.
BIT 7
(0)
(1)
BIT 6
(0)
(1)
BIT 5
(0)
(1)
BIT 4
RMC.4
BIT 3
RMC.3
BIT 2
RMC.2
BIT 1
RMC.1
BIT 0
RMC.0
6.4.17
RX B
UFFER
S
TART
A
DDRESS REGISTER
(RBSA)
TheRBSAregister(CAN address 30)reflectsthecurrently
valid internal RAM address, where the first byte of the
received message, which is mapped to the receive buffer
window, is stored. With the help of this information it is
possible to interpret the internal RAM contents.
The internalRAMaddressareabeginsatCAN address 32
and may be accessed by the CPU for reading and writing
(writing in reset mode only).
Example:
if RBSA is set to 24 (decimal), the current
message visible in the receive buffer window
(CAN address 16 to 28) is stored within the internal RAM
beginning at RAM address 24. Because the RAM is also
mapped directly to the CAN address space beginning at
CAN address 32 (equal to RAM address 0) this message
may also be accessed using CAN address 56 and the
following bytes
(CAN address = RBSA + 32 > 24 + 32 = 56).
If a message exceeds RAM address 63, it continues at
RAM address 0.
The release receive buffer command is always given while
there is at least one more message available within the
FIFO. RBSA is updated to the beginning of the next
message.
On hardware reset, this pointer is initialized to ‘00H’. Upon
a software reset (setting of reset mode) this pointer keeps
its old value, but the FIFO is cleared; this means that the
RAM contents are not changed, but the next received (or
transmitted) message will override the currently visible
message within the receive buffer window.
The RX buffer start address register appears to the CPU
as a read only memory in operating mode and as
read/write memory in reset mode. It should be noted that a
write access to RBSA takes effect first after the next
positive edge of the internal clock frequency, which is half
of the external oscillator frequency.
Table 43
Bit interpretation of the RX buffer start address register (RBSA); CAN address 30
Note
1.
This bit cannot be written. During read-out of this register always a zero is given.
BIT 7
(0)
(1)
BIT 6
(0)
(1)
BIT 5
RBSA.5
BIT 4
RBSA.4
BIT 3
RBSA.3
BIT 2
RBSA.2
BIT 1
RBSA.1
BIT 0
RBSA.0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SJA1000/N1,112 | 功能描述:網(wǎng)絡控制器與處理器 IC STAND-ALONE CAN CONTROLLER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| SJA1000/N1112 | 制造商:NXP Semiconductors 功能描述:IC CAN CONTROLLER 1000 DIP28 |
| SJA1000N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Stand-alone CAN controller |
| SJA1000T | 制造商:NXP Semiconductors 功能描述: |
| SJA1000T/N,112 | 功能描述:網(wǎng)絡控制器與處理器 IC STAND ALONE CAN CONTROLLER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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