M66011FP Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

Número de pieza

componentes Descripción

Lista de partido

M66011FP

SERIAL BUS CONTROLLER

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66011FP

SERIAL BUS CONTROLLER

3. Serial data input/output operation

A cycle of 16-bit serial output data setting and serial data

communication starts with a write access given by micro-

computer to transmission shift registers in M66011.

M66011 has two 8-bit shift registers, on for upper byte

(SRU), the other for lower byte (SRL). If the CS status rises

from “L” to “H” after a write access is given to SRL, serial

data communication is started. SRU 8-bit data and SRL, 8-

bit data are output in series in this order. Output of each

data starts from its most significant bit.

At the CS rise edge, busy flag in M66011 is set, and OE

output shifts from “H” to “L”. Shift clock SCLK and serial

data SOUT are then output.

At SCLK fall edges, serial output shift register executes

shifting operation, and data on shift register is output in se-

ries from pin SOUT. Serial input data from pin SIN is taken

into input shift register at SCLK 8T thru 16T rise edges.

However, data taken in at 8T rise edge is processed as ac-

knowledge bit, while data taken in at 9T thru 16T rise

edges are processed as data bits.

After the SCLK 16T rise edge, the status of SOUT and OE

shifts to “H” after one bit’s delay of SCLK, and busy flag is

reset. When interrupt output is being set to enable, INT

output is set.

(Remarks)

(1) If CS rises after write operation is executed on SRL only

and not on SRU, SRU data is unstable.

(2) When write operations executed on SRL, M66011 be-

comes ready for start of serial communication and stands

by for detection of CS rise. However, if a read access is

given after data is written on SRL while CS is maintained

on “L” level, this standby status is canceled. To resume se-

rial communication in this case, rewrite data on SRL and

raise CS.

SRL

write operation

CS

Busy flag

(in M66011)

OE

INT

Serial communication period

SCLK

SOUT

SIN

1T 2T

8T 9T

16T

D015 D014 D013 D012 D011 D010 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

(D7U)

(D0U) (D7L)

(D0L)

ACK DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0

Serial Communication Timing Chart

5

Share Link: