ＣＨ４５１是一个整合了数码管显示驱动和键盘扫描控制以及Ｐ监控的多功能外围芯片。ＣＨ４５１内置ＲＣ振荡电路，可以直接动态驱动８位数码管或者６４位ＬＥＤ， 具有ＢＣＤ译码或不译码功能，可实现数据的左移、右移、左循环、右循环、各数字独立闪烁等控制功能。 ＣＨ４５１内置大电流驱动级， 段电流不小于３０ｍＡ，字电流不小于１６０ｍＡ，并有１６ 级亮度控制功能；在键盘控制方面，该器件内置６４键键盘控制器，可实现８×８矩阵键盘扫描，并内置去抖动电路，可提供按键中断与按键释放标志位等功能；在外部接口方面， ＣＨ４５１可选择简洁的１线串行接口或高速４线串行接口，且内置上电复位，可提供高电平有效复位和低电平有效复位两种输出，同时内置看门狗电路Ｗａｔｃｈ－Ｄｏｇ。ＣＨ４５１提供有２８引脚的ＤＩＰ２８与ＳＯＰ２８封装以及ＤＩＰ２４Ｓ封装形式，２８脚与２４脚在功能上稍有差别-CH451 is an integrated LED display driver and the keyboard scan control and monitoring of the P-chip multifunction peripherals. RC oscillator circuit built-CH451, you can directly drive an 8-bit dynamic digital tube or 64-bit LED, with a BCD decoder or decoding function, data can be left, shifted to right, left circle, right circle, the number of independent scintillation and other control functions. CH451-level built-in high-current drive, current paragraph not less than 30mA, the word current is not less than 160mA, and a brightness control 16　in keyboard control, the device built-in 64-key keyboard controller can achieve 8 × 8 scan matrix keyboard and built-to-jitter circuit may interrupt the provision of key release and key features such as flag　the external interface, CH451 choose simple or 1-wire serial interface high-speed 4-wire serial interface, and built on power-on reset can be reset to provide high effective and efficient reduction of two low-level output, built-in watchd