M37480M8-XXXFP 데이터 시트보기 (PDF) - Renesas Electronics

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M37480M8-XXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

Renesas Electronics 

BEFORE USING THIS USER’S MANUAL

1. Manual Contents

This user’s manual consists of the following three chapters. Refer to the chapter appropriate to your conditions,

such as hardware design or software development.

q CHAPTER 1 – HARDWARE

This chapter describes the features of the microcomputers, the operation of their peripherals, and

their electrical characteristics.

q CHAPTER 2 – APPLICATIONS

This chapter describes usage of peripheral functions and application examples of the microcomputers,

focusing on the settings of the related registers.

q CHAPTER 3 – APPENDICES

This chapter describes all the control register configurations, and the mask ROM confirmation forms

(mask ROM version), the ROM programming confirmation forms (one time PROM version), and the

mark specification forms to be submitted at the ordering.

2. Register Configurations

An example of control register configurations of the 7480 Group and 7481 Group and the description of

symbols used in them are explained below.

Contents immediately after system is released from reset (Note 1)

Bit

b7 b6 b5 b4 b3 b2 b1 b0

0 0 CPU mode register (CPUM) [Address 00FB16]

Bit attributes (Note 2)

b

Name

0 Fix these bits to ‘0’

1

2 Stack page selection bit

(Note)

Function

0 : Zero page

1 : 1 page

3 Watchdog timer L count

source selection bit

0 : f(XIN)/8

1 : f(XIN)/16

4 Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

5 Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

At reset R W

0

O0

0

O0

0

OO

0

OO

Undefined Undefined ×

Undefined Undefined ×

6 Clock division

ratio selection bit

0 : f(XIN)/2 (high-speed mode)

1 : f(XIN)/8 (medium-speed mode)

7 Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

0

OO

Undefined Undefined ×

Note: In the products whose RAM size is 192 bytes or less, set this bit to ‘0’.

Notes 1: Contents after system is released from reset

0: ‘0’ after system is released from reset

1: ‘1’ after system is released from reset

undefined: undefined after system is released from reset

indicates the bit which is not implemented.

2: Bit attributes

R (Read)

O: Read enabled

×: Read disabled

Undefined: Undefined at reading

0: ‘0’ at reading

1: ‘1’ at reading

W (Write)

O: Write enabled

×: Write disabled

0: Fixed to ‘0’

∗: This bit can be set to ‘0’ by software, but cannot be set to ‘1’.

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