MN101C457
overview
, CPU basic functions, interrupt functions, port functions, timer functions, serial interface functions, and other peripheral hardware functions. Each section contains overview of function, block diagram, control register, operation, and setting example.
About This Manual 1 n Manual Configuration
Each section of this manual consists of a title, summary, main text, key information, precautions and warnings, and references. The layout and definition of each section are shown below.
Subtitle Sub-subtitle The smallest block in this manual. Main text
Key information Important information from the main text.
Chapter 2 Basic CPU
2-8 Reset
2-8-1 Reset operation
The CPU contents are reset and registers are initialized when the NRST pin (P.27) is pulled to low. n Initiating a Reset There are two methods to initiate a reset. (1) Drive the NRST pin low for at least four clock cycles.
NRST pin should be holded "low" for more than 4 clock cycles (200 n S at a 20 MHz).
NRST pin
4 clock...
