ML51Dec. 05, 2018 Page 5 of 401 Rev 1.00ML51 SERIES TECHNICAL REFERENCE MANUAL21.1 Functional Description ........................................................................................ 29321.1.1 ADC Operation..............................................................................................................29321.1.2 ADC Conversion Triggered by External Source ......................................................29521.1.3 ADC Conversion Result Comparator.........................................................................29521.1.4 ADC Continues Conversion ........................................................................................29621.2 Control Registers of ADC ................................................................................... 29722 VOLTAGE REFERENCE ............................................................................. 30423 ANALOG COMPARATOR CONTROLLER (ACMP) ................................... 30623.1 Functional Description ........................................................................................ 30623.2 Hysteresis Function ............................................................................................. 30723.3 Comparator Reference Voltage (CRV) ............................................................. 30823.4 Interrupt Sources ................................................................................................. 30923.5 Control Registers of ACMP Controller .............................................................. 31024 PDMA CONTROLLER (PDMA) ................................................................... 31424.1 Functional Description ........................................................................................ 31524.2 Operating Modes ................................................................................................. 31524.2.1 SPI peripheral to XRAM memory ...............................................................................31524.2.2 SMC/UART peripheral to XRAM memory .................................................................31624.2.3 Memory to Memory (XRAM) Transfer .......................................................................31624.3 PDMA Control Registers..................................................................................... 31725 TIMED ACCESS PROTECTION (TA) .......................................................... 32126 INTERRUPT SYSTEM ................................................................................. 32326.1 Interrupt Overview ............................................................................................... 32326.2 Enabling Interrupts .............................................................................................. 32426.3 Interrupt Priorities ................................................................................................ 32926.4 Interrupt Service................................................................................................... 33626.5 Interrupt Latency .................................................................................................. 33726.6 External Interrupt Pins ........................................................................................ 33727 IN-APPLICATION-PROGRAMMING (IAP) .................................................. 33927.1 IAP Commands .................................................................................................... 34327.2 IAP User Guide .................................................................................................... 34427.3 Using Flash Memory as Data Storage ............................................................. 34427.4 In-System-Programming (ISP) .......................................................................... 34628 POWER MANAGEMENT ............................................................................. 35228.1 Idle Mode .............................................................................................................. 353