M37532RSS datasheet(28/50 Pages) MITSUBISHI

28 / 50 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7532 Group

MITSUBISHI MICROCOMPUTERS

Note on using USB mode

Handling of SE0 signal in program (at receiving)

7532 group has the border line to detect as USB RESET or EOP

(End of Packet) on the width of SE0 (Single Ended 0).

A response apposite to a state of the device is expected.

The name of the following short words which is used in table 5 shows

as follow.

•TKNE: Token interrupt enable (bit 6 of address 2016)

•RSME: Resume interrupt enable (bit 5 of address 2016)

•RSTE: USB reset interrupt enable (bit 4 of address 2016)

•Spec: A response of the device requested by USB Specification 1.0

•SIE: Hardware operation in 7532 group

•F/W: Recommendation process in the program

•FEOPE: False EOP error flag (bit 2 of address 1916)

•RxPID: Token interrupt flag (bit 7 of address 1F16)

Spec

SIE

F/W

Reset or resume

Reset interrupt

request

Reset interrupt

processing

Resume interrupt

processing

Table 5 Relation of the width of SE0 and the state of the device

Width of SE0

µ sec.

0.5

µ sec.

0.5

µ sec.

2.5

µ sec.

2.5

µ sec.

2.67

µ sec.

2.67

µ sec.

Spec

SIE

F/W

Spec

SIE

F/W

Spec

SIE

F/W

Spec

SIE

F/W

Idle state

TKNE = X

RSME = 0

RSTE =1

Ignore

Keep counting suspend

timer

Not acknowledge

Keep alive

Initialize suspend timer

count value

Not acknowledge

Keep alive or Reset

may determine as keep

alive and Reset interrupt

Keep alive in case of no

interrupt request

Reset processing in case

of interrupt request

Reset

Reset interrupt request

Reset processing

End of Token in transaction

TKNE = 1

RSME = 0

RSTE =1

Ignore

Not detected as EOP(in

case of no detection EOP,

SIE returns idle state as

time out. FEOPE flag is

set.)

Not acknowledge

EOP

Token interrupt request

Token interrupt process-

ing execute

EOP or Reset

may determine as EOP

and Reset interrupt

RxPID = 1> Token

interrupt processing

RxPID = 0> Reset

interrupt processing

Reset

Reset interrupt request

Reset processing

End of data or handshake

in transaction

TKNE = 0

RSME = 0

RSTE = 0 or 1

Ignore

Not detected as EOP(in

case of no detection EOP,

SIE returns idle state as

timeup. FEOPE flag is

set.)

Wait for the next EOP flag

EOP

Set EOP flag

After checking the set of

EOP flag, go to the next

processing

EOP or Reset

may determine as EOP

and Reset interrupt

Continue the processing

in case of no interrupt

request

Reset processing in case

of interrupt request

Reset

Reset interrupt request

Reset processing

Suspend state

TKNE = 0

RSME = 1

RSTE = 0

State of device

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