7721 datasheet(8/577 Pages) RENESAS

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7721 Group User’s Manual

Table of contents

CHAPTER 1 DESCRIPTION

1.1 Performance overview.......................................................................................................... 1-2

1.2 Pin configuration ................................................................................................................... 1-3

1.3 Pin description ...................................................................................................................... 1-4

1.4 Block diagram ........................................................................................................................ 1-7

CHAPTER 2 CENTRAL PROCESSING UNIT (CPU)

2.1 Central processing unit ....................................................................................................... 2-2

2.1.1 Accumulator (Acc) ......................................................................................................... 2-3

2.1.2 Index register X (X) ....................................................................................................... 2-3

2.1.3 Index register Y (Y) ....................................................................................................... 2-3

2.1.4 Stack pointer (S) ............................................................................................................ 2-4

2.1.5 Program counter (PC) ................................................................................................... 2-5

2.1.6 Program bank register (PG) ......................................................................................... 2-5

2.1.7 Data bank register (DT) ................................................................................................ 2-5

2.1.8 Direct page register (DPR) ........................................................................................... 2-6

2.1.9 Processor status register (PS) ..................................................................................... 2-7

2.2 Bus interface unit ................................................................................................................. 2-9

2.2.1 Overview ......................................................................................................................... 2-9

2.2.2 Functions of bus interface unit (BIU) ........................................................................ 2-11

2.2.3 Operation of bus interface unit (BIU) ........................................................................ 2-13

2.3 Access space ....................................................................................................................... 2-15

2.3.1 Banks ............................................................................................................................ 2-16

2.3.2 Direct page ................................................................................................................... 2-16

2.4 Memory assignment ........................................................................................................... 2-17

2.4.1 Memory assignment in internal area ......................................................................... 2-17

2.4.2 External area ................................................................................................................ 2-18

2.5 Bus access right ................................................................................................................. 2-23

CHAPTER 3 CONNECTION WITH EXTERNAL DEVICES

3.1 Signals required for accessing external devices .......................................................... 3-2

3.1.1 Descriptions of signals .................................................................................................. 3-2

3.1.2 Operation of bus interface unit (BIU) .......................................................................... 3-5

3.2 Software Wait ......................................................................................................................... 3-8

3.3 Ready function .................................................................................................................... 3-10

3.3.1 Operation description .................................................................................................. 3-11

3.4 Hold function ....................................................................................................................... 3-12

3.4.1 Operation description .................................................................................................. 3-12

[Precautions for Hold function] ............................................................................................ 3-16

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