7480 datasheet(5/337 Pages) RENESAS

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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.

CHAPTER 1 – HARDWARE

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

their electrical characteristics.

CHAPTER 2 – APPLICATIONS

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

focusing on the settings of the related registers.

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.

b4 b3 b2 b1 b0

Name

Function

At reset

Undefined

Fix these bits to ‘0’

Stack page selection bit

(Note)

0 : Zero page

1 : 1 page

Watchdog timer L count

source selection bit

0 : f(XIN)/8

1 : f(XIN)/16

Clock division

ratio selection bit

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

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

Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

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

Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

Undefined

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

2: Bit attributes

R (Read)

O: Read enabled

×: Read disabled

Undefined: Undefined at reading

0: ‘0’ at reading

1: ‘1’ at reading

O: Write enabled

×: Write disabled

0: Fixed to ‘0’

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

W (Write)

indicates the bit which is not implemented.

Bit

Bit attributes (Note 2)

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

CPU mode register (CPUM) [Address 00FB16]

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