M66011FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M66011FP

SERIAL BUS CONTROLLER

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66011FP

SERIAL BUS CONTROLLER

OPERATION

1. Write operation

(1) Serial output data setting

The M66011 has two built-in 8-bit shift registers. They are

used to set serial output data.

When the address setting is (A1, A0) = (0, 1), 8-bit data on

data bus is written on the upper byte serial output shift reg-

ister (SRU). When the address setting is (A1, A0) = (0, 0),

the data is written on the lower byte serial output shift reg-

ister (SRL). In either case, data write starts when WR is on

the “L” level.

(2) Status register setting

When the address setting is (A1, A0) = (1, 1), written data

becomes the setting of status register in M66011. (Refer

to the table below.)

Write Operation Basic Functions (Note 1)

CS A1 A0 RD WR

0

0

0

1

0 • Lower byte serial output shift register

0

0

1

1

0 • Upper byte serial output shift register

0

1

1

1

0

• Shift clock divider ratio register

• Interrupt output control register

Note 1: Figure “0” indicates “L” level, while “1” indicates “H” level.

Functions

←

←

←

Data bus data

Data bus data

(Note 2)

Data bus data

Note 2:

D7 D6 D5

Don’t care

D4 D3 D2 D1 D0

D1 D0 Divider ratio

00

1/2

01

1/4

Don’t care

10

1/8

11

1/16

“0”: Interrupt output disable

(INT output is fixed to “L”.)

“1”: Interrupt output enable

(INT output shifts from “L” to “H” when serial communication is completed.)

CS

WR

Data buses

D0~D7

OE

SOUT

SCLK

Write on SRU

Write on SRL

"L" or "H"

D0U~D7U

D0L~D7L

D7U~D0U D7L~D0L

Write Operation Basic Timing (Serial Output Data Setting)

3

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