Renesas rl78 User Manual
CHAPTER 19 RESET FUNCTION........................................................................................................ 740
19.1 Timing of Reset Operation ..................................................................................................... 742
19.2 States of Operation During Reset Periods ........................................................................... 744
19.3 Register for Confirming Reset Source.................................................................................. 746
19.3.1 Reset control flag register (RESF) .............................................................................................. 746
CHAPTER 20 POWER-ON-RESET CIRCUIT ...................................................................................... 749
20.1 Functions
of
Power-on-reset Circuit ..................................................................................... 749
20.2 Configuration of Power-on-reset Circuit............................................................................... 750
20.3 Operation of Power-on-reset Circuit ..................................................................................... 750
CHAPTER 21 VOLTAGE DETECTOR ................................................................................................. 754
21.1 Functions of Voltage Detector ............................................................................................... 754
21.2 Configuration of Voltage Detector......................................................................................... 755
21.3 Registers Controlling Voltage Detector ................................................................................ 755
21.3.1 Voltage
detection register (LVIM) ............................................................................................... 756
21.3.2 Voltage
detection level register (LVIS)........................................................................................ 757
21.4 Operation of Voltage Detector ............................................................................................... 760
21.4.1 When
used
as reset mode .......................................................................................................... 760
21.4.2 When used as interrupt mode..................................................................................................... 762
21.4.3 When used as interrupt & reset mode ........................................................................................ 764
21.5 Cautions for Voltage Detector ............................................................................................... 770
CHAPTER 22 SAFETY FUNCTIONS ................................................................................................... 772
22.1 Overview of Safety Functions................................................................................................ 772
22.2 Registers Used by Safety Functions..................................................................................... 773
22.3 Operation of Safety Functions............................................................................................... 773
22.3.1 Flash memory CRC operation function (high-speed CRC) ......................................................... 773
22.3.2 CRC operation function (general-purpose CRC) ........................................................................ 776
22.3.3 RAM parity error detection function ............................................................................................ 778
22.3.4 RAM
guard function .................................................................................................................... 780
22.3.5 SFR
guard function ..................................................................................................................... 781
22.3.6 Invalid memory access detection function .................................................................................. 782
22.3.7 Frequency
detection function...................................................................................................... 784
22.3.8 A/D
test function ......................................................................................................................... 786
CHAPTER 23 REGULATOR ................................................................................................................. 791
23.1 Regulator
Overview................................................................................................................. 791
CHAPTER 24 OPTION BYTE............................................................................................................... 792
24.1 Functions of Option Bytes ..................................................................................................... 792
24.1.1 User option byte (000C0H to 000C2H/010C0H to 010C2H) ....................................................... 792
24.1.2 On-chip debug option byte (000C3H/ 010C3H) .......................................................................... 793
24.2 Format of User Option Byte ................................................................................................... 794
Index-11