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Table 13.4 flags and transfer states (master mode) – Renesas H8S/2111B User Manual

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Rev. 1.00, 05/04, page 294 of 544

Table 13.4 Flags and Transfer States (Master Mode)

MST TRS

BBSY

ESTP

STOP

IRTR

AASX

AL AAS

ADZ

ACKB ICDRF ICDRE

State

1 1 0 0 0 0 0

↓ 0 0↓

0

0

0

Idle state (flag
clearing required)

1 1 1

↑ 0 0 1↑ 0 0 0 0 0 — 1↑ Start

condition

detected

1 — 1 0 0 — 0 0 0 0 — — — Wait

state

1 1 1 0 0 — 0 0 0 0 1

↑ — — Transmission

end

(ACKE=1 and
ACKB=1)

1 1 1 0 0 1

↑ 0 0 0 0 0 — 1↑ Transmission

end

with ICDRE=0

1 1 1 0 0 — 0 0 0 0 0 — 0

ICDR write with the
above state

1 1 1 0 0 — 0 0 0 0 0 — 1 Transmission

end

with ICDRE=1

1 1 1 0 0 — 0 0 0 0 0 — 0

ICDR write with the
above state or after
start condition
detected

1 1 1 0 0 1

↑ 0 0 0 0 0 — 1↑ Automatic

data

transfer from
ICDRT to ICDRS
with the above
state

1 0 1 0 0 1

↑ 0 0 0 0 — 1↑ — Reception

end

with

ICDRF=0

1 0 1 0 0 — 0 0 0 0 — 0

ICDR read with the
above state

1 0 1 0 0 — 0 0 0 0 — 1 — Reception

end

with

ICDRF=1

1 0 1 0 0 — 0 0 0 0 — 0

ICDR read with the
above state

1 0 1 0 0 1

↑ 0 0 0 0 — 1↑ — Automatic

data

transfer from
ICDRS to ICDRR
with the above
state

0

0

↓ 1 0 0 — 0 1↑ 0 0 — — — Arbitration

lost

1 — 0

↓ 0 0 — 0 0 0 0 — — 0↓ Stop

condition

detected

[Legend]
0:

0-state retained

1: 1-state

retained

—: Previous

state

retained

0

:

Cleared to 0

1

:

Set to 1

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