7477 datasheet(5/354 Pages) RENESAS

5 / 354 page

BEFORE USING THIS USER’S MANUAL

1. Organization

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 features of the microcomputer and operation of each peripheral function.

q CHAPTER 2 APPLICATION

This chapter describes usage and application examples of peripheral functions, based mainly on setting

examples of related registers.

q CHAPTER 3 APPENDIX

This chapter includes a list of registers, and necessary information for systems development using the

microcomputer, the masking confirmation (mask ROM version), ROM programming confirmation, and

mark specifications which are to be submitted when ordering.

2. Structure of Register

The figure of each register structure describes its functions, contents at reset, and attributes as follows:

b7 b6 b5 b4 b3 b2 b1 b0

Fix these bits to “0.”

Stack page selection bit

Nothing is allocated for this bit. This is write

enabled bit and is undefined at reading.

XCOUT drive capacity

selection bit

Main clock (XIN–XOUT)

stop bit

Internal system clock

selection bit

P50, P51/XCIN, XCOUT

selection bit

0: In page 0 area

1: In page 1 area

0: Low

1: High

0: Oscillates

1: Stops

0: XIN–XOUT selected

(Ordinary mode)

1: XCIN–XCOUT selected

(low-speed mode)

0: P50, P51

1: XCIN, XCOUT

Name

Function

At reset

0, 1

Bits

CPU mode register (CPUM) [Address: FB 16]

Bit attributes

CPU mode register

Contents immediately after reset release

: Bit in which nothing is arranged

Note 1. Contents immediately after reset release

“0” at reset release

“1” at reset release

Undefined at reset release

Note 2. Bit attributes

(Note 1)

(Note 2)

Write

Write enabled

Write disabled

Fix to“0”.

Can be cleared to“0” by software but not set to “1”.

Read

Read enabled

Undefined at reading

“

1” at reading

“

0” at reading

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