View hcs360 datasheet:

M HCS360 Code Hopping Encoder FEATURES PACKAGE TYPES PDIP, SOIC Security 8 S0 VDD 1 • Programmable 28/32-bit serial number • Programmable 64-bit encryption key 7 LED 2 S1 • Each transmission is unique • 67-bit transmission code length 6 PWM 3 S2 • 32-bit hopping code • 35-bit fixed code (28/32-bit serial number, VSS S3 4 5 4/0-bit function code, 1-bit status, 2-bit CRC) • Encryption keys are read protected Operating HCS360 BLOCK DIAGRAM • 2.0-6.6V operation Oscillator Power • Four button inputs latching and - 15 functions available Controller Reset circuit switching • Selectable baud rate LED • Automatic code word completion LED driver • Battery low signal transmitted to receiver • Nonvolatile synchronization data • PWM and Manchester modulation E