CONTENTS
CHAPTER 1 NT85E500..............................................................................................................................14
1.1 Outline............................................................................................................................................14
1.1.1 Features..............................................................................................................................................15
1.1.2 Symbol diagram..................................................................................................................................16
1.1.3 Block diagram.....................................................................................................................................17
1.1.4 Configuration example........................................................................................................................19
1.1.5 Functional differences between NT85E500 and NU85E500 ..............................................................20
1.2 Pin Functions ................................................................................................................................21
1.2.1 List of pin functions.............................................................................................................................21
1.2.2 Explanation of pin functions................................................................................................................24
1.2.3 Recommended connection of unused pins.........................................................................................34
1.2.4 Pin status............................................................................................................................................35
1.3 Bus Cycle Function.......................................................................................................................37
1.3.1 Bus cycle type configuration registers 0 and 1 (BCT0 and BCT1)......................................................37
1.3.2 Address setting wait control register (ASC) ........................................................................................39
1.3.3 Bus cycle control register (BCC).........................................................................................................40
1.3.4 Data wait control registers 0 and 1 (DWC0 and DWC1).....................................................................41
1.3.5 SRAM cycle ........................................................................................................................................43
1.3.6 Page ROM configuration register (PRC).............................................................................................51
1.3.7 Page ROM cycle.................................................................................................................................53
1.3.8 Bus hold function ................................................................................................................................61
1.3.9 Bus cycle period control register (BCP)..............................................................................................63
1.3.10 STOP function.....................................................................................................................................65
1.4 Test Function.................................................................................................................................66
1.5 Data Flow .......................................................................................................................................67
1.5.1 Data flow for byte access (8 bits)........................................................................................................68
1.5.2 Data flow for halfword access (16 bits)...............................................................................................72
1.5.3 Data flow for word access (32 bits).....................................................................................................76
CHAPTER 2 NT85E502..............................................................................................................................82
2.1 Outline............................................................................................................................................82
2.1.1 Features..............................................................................................................................................83
2.1.2 Symbol diagram..................................................................................................................................84
2.1.3 Block diagram.....................................................................................................................................85
2.1.4 Configuration example........................................................................................................................86
2.1.5 Functional differences between NT85E502 and NU85E502 ..............................................................88
2.2 Pin Functions.................................................................................................................................89
2.2.1 List of pin functions.............................................................................................................................89
2.2.2 Explanation of pin functions................................................................................................................90
2.2.3 Recommended connection of unused pins.........................................................................................94
9
Preliminary User's Manual A15019EJ3V0UM
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