The main objective of this system is to transmit message or text through ordinary Land Line Telephone from one end (source) to another end (designation). This is get achieved by the DTMF technology. It has two sections one for editing the text and to

The main objective of this system is to transmit message or text through ordinary Land Line Telephone from one end (source) to another end (designation). This is get achieved by the DTMF technology. It has two sections one for editing the text and to

多任务 Cortex-M3 OS 平台 支持消息 事件 钩子 任务逻辑切换 任务时间限制, 请在HT32F-M3芯片上测试-Muti Task Cortex-M3 OS Message Event Hook Task TimeSwitch HT32FXXXX

Determines bias voltage at switch on. Must be on-hook and snoop resistors disconnected. Once bias is determined, snoop resistors may read the line voltage. Relative changes in line voltage to bias are used to determine the line state. conta