参数资料
型号: MSM6636JS
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, PQCC18
封装: 0.290 INCH, 1.27 MM PITCH, PLASTIC, QFJ-18
文件页数: 24/72页
文件大小: 707K
代理商: MSM6636JS
MSM6636/6636B User’s Manual
CPU Interfaces
4 – 3
[READ PROCEDURE]
Send the address of the read target register and the communication type first, then receive the read data. Since
address values are automatically incremented, it is speedy to read data of the registers that have consecutive
addresses.
1.
Set “1” to the A-D pin to send the read destination address and the communication type.
2.
Synchronize 8 bits of the register read code, M1, M0 = “1, 0”, and the read destination address values “A5
to A0” to SCLK with LSB first, then send it to RXD input.
3.
Data input to RXD is sampled at the rising edge of SCLK.
4.
8 bits of read data is sent from TXD output, synchronizing to SCLK with LSB first. Sample the read data
at the rise of SCLK at the CPU side. (In MSM6636, data transmit and receive are simultaneous, so in the
case of continuous read, set the RXD pin to “H” or “ L”.)
5.
Automatic increment of read destination address values operate every time one data reading ends. (This
makes continuous data reading possible.)
[COMMUNICATION TYPE AND COMMUNICATION ADDRESS]
M1
7
M0
6
A5
5
A4
4
A3
3
A2
2
A1
1
A0
0
High-order 2 bits (communication type)
Low-order 6 bits (communication address)
01: WR Register
Write destination address
10: RD Register
Read destination address
SCLK
RXD
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
TXD
A-D
(3)
(2)
(1)
Notes:
(1) In the MSM6636, data is actually sampled at the A-D pin at the rise of the final SCLK of 1 frame to
determine whether data is address information or data itself. Set up the A-D pin before the final SCLK
input.
(2) In the MSM6636, “D0” is output to the TXD pin when setting transmit data to the transmit register is
completed. “D1” and later data are output synchronizing to the rise of SCLK. For details, see Section 7.4,
“AC Characteristics”.
(3) In the MSM6636, RXD data is sampled at the rise of SCLK.
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