Ibm uPD78082 Manual de usuario Pagina 100
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77
CHAPTER 5 CLOCK GENERATOR
5.6 Changing CPU Clock Settings
5.6.1 Time required for CPU clock switchover
The CPU clock can be switched over by means of bits 0 to 2 (PCC0 to PCC2) of the processor clock control register
(PCC).
The actual switchover operation is not performed directly after writing to the PCC, but operation continues on the
pre-switchover clock for several instructions (see Table 5-2).
Table 5-2. Maximum Time Required for CPU Clock Switchover
100110100100000
PCC0PCC2 PCC1
0
00
011
00
0
1
1
1
8 instructions
2 instructions
4 instructions 4 instructions
2 instructions
8 instructions
4 instructions 4 instructions
2 instructions
8 instructions 8 instructions
2 instructions
Set Values After Switchover
Set Values before
Switchover
1 instruction 1 instruction1 instruction
PCC1PCC2 PCC0PCC1PCC2 PCC0PCC1PCC2 PCC0PCC1PCC2 PCC0PCC1PCC2 PCC0
1 instruction
Remark One instruction is the minimum instruction execution time with the pre-switchover CPU clock.
000 16 instructions 16 instructions 16 instructions 16 instructions
- PD78083 1
- SUBSERIES 1
- NOTES FOR CMOS DEVICES 2
- M7 96.5 4
- Regional Information 5
- Other Documents 11
- FIGURE (1/4) 17
- FIGURE (2/4) 18
- FIGURE (3/4) 19
- FIGURE (4/4) 20
- TABLE (1/2) 21
- TABLE (2/2) 22
- CHAPTER 1 OUTLINE 24
- 1.1 Features 24
- 1.2 Applications 25
- 1.3 Ordering Information 25
- 1.4 Quality Grade 26
- DD pin to VDD 27
- SS pin to VSS 27
- SS directly 28
- Pin Identifications 29
- SS via a pull-down resistor 30
- SS : Connect to the ground 30
- DD : Power Supply 31
- PP : Programming Power Supply 31
- SS : Ground 31
- 1.6 78K/0 Series Development 32
- Note 10 bits timer: 1 channel 33
- 1.7 Block Diagram 34
- DD = 1.8 to 5.5 V 35
- A = –40 to +85°C 35
- PD78081(A), 78082(A) and 36
- 78P083(A), and the 36
- PD78081(A2) 36
- CHAPTER 1 OUTLINE 37
- CHAPTER 2 PIN FUNCTION 38
- 2.1 Pin Function List 38
- (2) Pins other than port pins 39
- PD78P083 only) 39
- CHAPTER 2 PIN FUNCTION 40
- As short as possible 44
- CHAPTER 3 CPU ARCHITECTURE 48
- 3.1 Memory Spaces 48
- Figure 3-2. Memory Map ( 49
- PD78082) 49
- Figure 3-3. Memory Map ( 50
- PD78P083) 50
- CHAPTER 3 CPU ARCHITECTURE 52
- PD78081) 53
- IE Z RBS1 AC RBS0 0 ISP CY 56
- PD78081 : 82H 62
- PD78082 : 64H 62
- PD78P083 : 46H 62
- Identifier Description 68
- [Illustration] 72
- — [HL + byte] 74
- — [HL + B], [HL + C] 75
- CHAPTER 4 PORT FUNCTIONS 76
- 4.1 Port Functions 76
- Table 4-1. Port Functions 77
- 4.2 Port Configuration 78
- Internal bus 80
- PM : Port mode register 84
- RD : Port 7 read signal 84
- WR : Port 7 write signal 84
- CHAPTER 4 PORT FUNCTIONS 86
- Input/Output 87
- 4.4 Port Function Operations 90
- CHAPTER 5 CLOCK GENERATOR 92
- CHAPTER 5 CLOCK GENERATOR 94
- 5.4 System Clock Oscillator 96
- (c) Signals are fetched 98
- 5.4.2 Scaler 98
- X) is secured automatically 101
- PM101 : Bit 1 of PM10 106
- 2. n = 5, 6 106
- X = 5.0 MHz 108
- X or fX/2) 109
- Remark n = 5, 6 120
- CHAPTER 7 WATCHDOG TIMER 126
- 7.1 Watchdog Timer Functions 126
- CHAPTER 7 WATCHDOG TIMER 127
- Selector 128
- PCL/P35 Pin Output 134
- CHAPTER 10 A/D CONVERTER 142
- 10.1 A/D Converter Functions 142
- CHAPTER 10 A/D CONVERTER 143
- Tap Selector 143
- REF = VDD 154
- REF and ANI0 to ANI7. Since 155
- REF pin input impedance 155
- REF pin and the AVSS pin 155
- RESET input sets ASIM to 00H 172
- ParityRxD Pin 185
- <3><1> 185
- <2> 185
- WDT : Watchdog timer 205
- CPU: CPU clock) 207
- 1 Instruction 212
- Execution 212
- CHAPTER 13 STANDBY FUNCTION 216
- 13.2.1 HALT mode 218
- Oscillation 220
- DD via a pull-up resistor 221
- CHAPTER 14 RESET FUNCTION 224
- 14.1 Reset Function 224
- CHAPTER 14 RESET FUNCTION 226
- CHAPTER 15 228
- PD78P083 228
- 15.2 PROM Programming 230
- DD = 6.5 V, VPP = 12.5 V 232
- DD = 4.5 to 5.5 V, VPP = VDD 232
- DD and VPP pins 236
- CHAPTER 16 INSTRUCTION SET 238
- CHAPTER 16 INSTRUCTION SET 239
- 16.2 Operation List 241
- Note 1 Note 2 243
- (1) 8-bit instructions 249
- [HL + B] $addr16 250
- [HL + C] 250
- APPENDIX A DEVELOPMENT TOOLS 254
- A.2 PROM Programming Tools 257
- A.3 Debugging Tools 258
- A.3.2 Software (1/3) 259
- S××××SM78K0 259
- A.3.2 Software (2/3) 260
- S××××ID78K0 260
- A.4 OS for IBM PC 262
- Based on EV-9200G-44 264
- (1) Package drawing (in mm) 264
- (2) Pad drawing (in mm) 265
- B.1 Real-time OS 267
- APPENDIX C REGISTER INDEX 270
- C.1 Register Index 270
- APPENDIX C REGISTER INDEX 271
- DD = 1.8 to 5.5V 272
- Facsimile 274
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