參數(shù)資料
型號: 73M2921-IG
廠商: Electronic Theatre Controls, Inc.
英文描述: Advanced Single Chip Modem
中文描述: 先進的單芯片調制解調器
文件頁數(shù): 15/41頁
文件大小: 222K
代理商: 73M2921-IG
73M2921
Advanced Single
Chip Modem
February 99 Rev M
TDK Semiconductor
Page 15 of 41
(1) The
μ
C writes a Control byte (UA1:0 = 10b) to the mailbox with the R/
:
bit in the appropriate state for a read
or a write.
(2) Then the
μ
C writes a Data byte (UA1:0 = 11b). The Data byte contains the data to be written or null (00h) if a
read is performed. Order is important as the Data byte triggers an internal interrupt in the 73M2921 firmware
indicating new mail present. The 73M2921 then:
(a) reads the mailbox
(b) writes back to the mailbox register the Control Byte.
(c) writes a response code (if R/
:
= 0) or data (if R/
:
= 1) to the Data Byte. The response code will be 00h
for OK and 01h for ERROR
(d) Lowers
8,17
to interrupt the
μ
C indicating that data is in the Mailbox from the 73M2921.
The response from the 73M2921 can either be polled by the host controller or interrupt-driven. In the interrupt-
driven response, an interrupt is issued by the 73M2921 from
8,17
when the response data is available, at which
time the microcontroller reads two bytes (Control, Data) from the 73M2921. Reading valid Data clears the
8,17
interrupt for the next command. All reads and writes to the General registers will get an immediate response. In a
polled mode of operation, if data is not ready, the Control and Data byte will both be zero. When the Control byte
is non-zero, data is available.
(3) The
μ
C reads the Control byte (UA1:0 = 10b).
(4) The
μ
C reads the Data byte (UA1:0 = 11b). The data is the response code if the
μ
C had requested a write, or
the contents of the General Register in the Control address field if the
μ
C had requested a read. This clears
the
8,17
to a high state. The ERROR indicator byte should never be received when communications
between the
μ
C and the 73M2921 are working properly.
The Control byte returned by the 73M2921 is broken down into bit segments as follows:
Control byte 73M2921 to Microcontroller
BIT 5
BIT 4
R/
:
1/0
UR = Unsolicited Response. Set if data is not response to last command.
WT/
%7
= Word Transfer/Byte Transfer. Should be 0 (byte transfer) for GRA.
R/
:
= Read = 1, Write = 0.
Register Address shadows last operation.
BIT 7
UR
1/0
BIT 6
WT/
%7
0
BIT 3
BIT 2
BIT 1
BIT 0
---------- Register Address Bits --------------
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