![](http://datasheet.mmic.net.cn/370000/-PD30101_datasheet_16680756/-PD30101_13.png)
- vii -
9.1 NONMASKABLE INTERRUPT (NMI).................................................................... 165
9.2 ORDINARY INTERRUPTS .................................................................................... 166
9.3 SOFTWARE INTERRUPTS GENERATED IN CPU CORE..................................... 166
9.4 TIMER INTERRUPT.............................................................................................. 166
9.5 ASSERTING INTERRUPTS................................................................................... 167
9.5.1 Detecting Hardware Interrupts ........................................................................................... 167
9.5.2 Masking Interrupt Signals................................................................................................... 168
CHAPTER 10 BCU (BUS CONTROL UNIT)...................................................... 169
10.1 GENERAL........................................................................................................... 169
10.2 REGISTER SET .................................................................................................. 169
10.2.1 BCUCNTREG................................................................................................................... 170
10.2.2 BCUBRREG..................................................................................................................... 171
10.2.3 BCUBRCNTREG.............................................................................................................. 172
10.2.4 BCUBCLREG................................................................................................................... 173
10.2.5 BCUBCLCNTREG............................................................................................................ 174
10.2.6 BCUSPEEDREG.............................................................................................................. 175
10.2.7 BCUERRSTREG.............................................................................................................. 177
10.2.8 BCURFCNTREG.............................................................................................................. 178
10.2.9 PREVIDREG.................................................................................................................... 179
10.3 MEMORY ACCESS BY BCU............................................................................... 180
10.3.1 Address Map.................................................................................................................... 180
10.3.2 Address Space for ROM .................................................................................................. 180
10.3.3 Address Space for Expansion Bus................................................................................... 181
10.3.4 Address Space for Registers............................................................................................ 182
10.3.5 Address Space for LCD.................................................................................................... 182
10.3.6 Address Space for DRAM................................................................................................ 183
10.4 CONNECTION OF ADDRESS TERMINALS........................................................ 183
10.5 NOTES FOR USING BCU................................................................................... 185
10.5.1 CPU Core Bus Modes...................................................................................................... 185
10.5.2 Access Data Size............................................................................................................. 185
10.5.3 ROM Interface.................................................................................................................. 186
10.5.4 Flash Memory Interface.................................................................................................... 187
10.5.5 Expansion Bus Interface .................................................................................................. 188
10.5.6 LCD Controller Interface................................................................................................... 189
10.5.7 Notice of an Illegal Access............................................................................................... 190
10.6 BUS OPERATION ............................................................................................... 190
10.6.1 ROM Access .................................................................................................................... 190
10.6.2 Expansion Bus Interface .................................................................................................. 194
10.6.3 LCD Interface................................................................................................................... 198
10.6.4 DRAM Access (EDO type)............................................................................................... 199