An updated process parameter to an autonomous process control peripheral is autonomously obtained when made available by a process monitor peripheral, such as an analog-to-digital converter (ADC). The input can be obtained in response to a system event, such as a completed ADC conversion. The autonomous process control peripheral can compute an updated control variable each time the process variable is updated. When the updated control variable is calculated by the autonomous process control peripheral, the updated control variable is autonomously transferred or otherwise made available (e.g., through a register) by the autonomous process control peripheral to a process actuate peripheral. The process actuate peripheral uses the updated control variable to adjust the process being controlled.