4.3.9
Port CS ........................................................................................................................................ 125
4.3.10 Port CT ........................................................................................................................................ 127
4.3.11 Port DH........................................................................................................................................ 129
4.3.12 Port DL......................................................................................................................................... 131
Block Diagrams ........................................................................................................................ 134
Port Register Setting When Alternate Function Is Used...................................................... 160
Cautions.................................................................................................................................... 166
4.4
4.5
4.6
4.6.1
4.6.2
Cautions on bit manipulation instruction for port n register (Pn) .................................................. 166
Hysteresis characteristics ............................................................................................................ 167
CHAPTER 5 BUS CONTROL FUNCTION.......................................................................................... 168
5.1
5.2
Features .................................................................................................................................... 168
Bus Control Pins ...................................................................................................................... 169
5.2.1
5.2.2
Pin status when internal ROM, internal RAM, or on-chip peripheral I/O is accessed................... 170
Pin status in each operation mode............................................................................................... 170
5.3
Memory Block Function........................................................................................................... 171
5.3.1
Chip select control function.......................................................................................................... 172
5.4
5.5
External Bus Interface Mode Control Function..................................................................... 172
Bus Access............................................................................................................................... 173
5.5.1
5.5.2
5.5.3
Number of clocks for access........................................................................................................ 173
Bus size setting function .............................................................................................................. 173
Access by bus size ...................................................................................................................... 174
5.6
Wait Function............................................................................................................................ 181
5.6.1
5.6.2
5.6.3
5.6.4
Programmable wait function ........................................................................................................ 181
External wait function................................................................................................................... 182
Relationship between programmable wait and external wait ....................................................... 183
Programmable address wait function........................................................................................... 184
5.7
5.8
Idle State Insertion Function................................................................................................... 185
Bus Hold Function ................................................................................................................... 186
5.8.1
5.8.2
5.8.3
Functional outline......................................................................................................................... 186
Bus hold procedure...................................................................................................................... 187
Operation in power save mode.................................................................................................... 187
5.9
Bus Priority............................................................................................................................... 188
5.10 Bus Timing................................................................................................................................ 189
5.11 Cautions.................................................................................................................................... 195
CHAPTER 6 CLOCK GENERATION FUNCTION............................................................................... 196
6.1
6.2
6.3
6.4
Overview ................................................................................................................................... 196
Configuration............................................................................................................................ 197
Registers................................................................................................................................... 199
Operation .................................................................................................................................. 203
6.4.1
6.4.2
6.4.3
Operation of each clock ............................................................................................................... 203
Clock output function ................................................................................................................... 203
External clock input function ........................................................................................................ 203
6.5
PLL Function ............................................................................................................................ 204
6.5.1
6.5.2
6.5.3
Overview...................................................................................................................................... 204
Register ....................................................................................................................................... 204
Usage .......................................................................................................................................... 205
10
User’s Manual U16890EJ1V0UD
NEC [ NEC ]
