M32171F3 Просмотр технического описания (PDF) - Renesas Electronics

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M32171F3

32-BIT RISC SINGLE-CHIP MICROCOMPUTER M32R FAMILY / M32R/ECU SERIES

Renesas Electronics 

How to read internal I/O register tables

➀ Bit Numbers: Each register is connected with an internal bus of 16-bit

wide, so the bit numbers of the registers located at even

addresses are D0-D7, and those at odd addresses are

D8-D15.

➁ State of Register at Reset: Represents the initial state of each register

immediately after reset with hexadecimal numbers

(undefined bits after reset are indicated each in column ➂.)

➂ At read:

... read enabled

? ... read disabled (read value invalid)

0 ... Read always as 0

1 ... Read always as 1

{ At write:

: Write enabled

: Write enable conditionally

(include some conditions at write)

- : Write disabled (Written value invalid)

<Example of representation>

Not implemented

in the shaded portion.

1

D0

1

2

3

Abit

Bbit

Cbit

Registers represented with thick rectangles

are accessible only with halfwords or words

(not accessible with bytes).

4

D

Bit name

0

Not assigned.

1

Abit

(...................)

2

Bbit

(...................)

3

Cbit

(...................)

Function

0: -----

1: -----

0: -----

1: -----

0: -----

1: -----

2

<at reset: H'04>

RW

0

3

4

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