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| 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： | 29/72页 |
| 文件大小： | 707K |
| 代理商： | MSM6636JS |
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MSM6636/6636B User’s Manual
CPU Interfaces
4 – 8
4.2 MSM6636B
The internal registers can be accessed through parallel interface. This facilitates interfacing with a microcontroller
that has an address multiplex type bus port.
4.2.1 Parallel Interface
The internal registers can be accessed through parallel interface by applying a “L” level to the
CS pin. After a
“L” level is applied to the
CS pin, be sure to make address settings before reading or writing data. Parallel
interface allows the internal registers to be accessed asynchronously with the internal clock.
While accessing through the parallel interface, avoid device operation where a “L” level is applied to the
WR
and
RD pins simultaneously or the case that both of them are at a “L” level at the same time.
Applying a “H” level to the
CS pin disables access though parallel interface. In this case, pins WR, RD, ALE,
and AD0 to AD7 will be set to high impedance input.
[PIN CONNECTION]
Host CPU
MSM6636B
J1850 Bus
AD0-AD7
8
ALE
AD0-AD7
RD
WR
Pxx
CS
Pxx
RES
INT
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