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| 型号： | MSM6636GS-VK |
| 厂商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 41.6K bps, LOCAL AREA NETWORK CONTROLLER, PDSO24 |
| 封装： | 0.430 INCH, 1.27 PITCH, PLASTIC, SOP-24 |
| 文件页数： | 36/70页 |
| 文件大小： | 1115K |
| 代理商： | MSM6636GS-VK |
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MSM6636/6636B User’s Manual
Function Details
5 – 3
5.4 CPU Interrupt Function
When transmit/receive is completed, or when various errors occur, an interrupt can be requested to the host CPU
by
INT output (low active). Also interrupt enable/disable can be set for each interrupt cause.
The host CPU can clear an interrupt request (
INT output = “H”) by writing “0” to the corresponding bit of an
interrupt request flag in an interrupt process routine.
However, the flag is not set by writing “1” in the interrupt request flag, but the previous state is held. Therefore,
other interrupts can be received during clearing operation by writing “0” to only the corresponding bits of the
causes to be cleared and “1” to other bits.
An interrupt request is cleared when all bits set to interrupt enable status are cleared. (See below.)
INT
Interrupt cause
A generated
Interrupt cause
A cleared
Interrupt cause
A generated
Interrupt cause
B generated
Interrupt cause
A cleared
Interrupt cause
B cleared
5.5 Receive Message Length Error Detection Function
When a message length exceeds 12 bytes, only the transmission and reception nodes of the message set an
interrupt request flag LEN. And then a reception message or reception response is not stored in reception
register. The message transmission or response transmission continues even if this flag is set.
5.6 Local-Station Bus Driver Abnormal Detection Function
If a passive status is received although a dominant status was output on LAN bus, an interrupt request flag D-P is
set and this function notifies that the local-station bus driver is abnormal. In addition, the message transmission
or response transmission is discontinued at once.
5.7 Communication Check Function between Specific Nodes
This function checks whether communication between specific nodes was normal or not by sending the response
type (K, Y, Z1, Z0) = (0, 1, 0, 0) (physical address & IFR type 1) messages.
The specific node that normally received the message of the abovementioned response type sends back the
physical address (ID) of the local-station as an in-frame response. The node that sent the message does not
store this returned response in a reception register, and an interrupt request flag TR is set only when the value of
a sent remote reception address was coincident with that of a received response. At this time, an interrupt
request flag RSP is not set. Therefore, whether the communication is normal or not can be judged by checking
only the TR flag, which helps reduce the software load. Also, the setting of a read completion command
(address 21H ) is not required, because the response received at this time is not stored in the reception register.
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