• sbit
• sfr

• bit
  
• [unsigned] char
  
• [unsigned] int

• data
  
• idata
  
• pdata
  
• xdata
  
• code

Example1:

unsigned char data output;

Example 2:

sfr PSW = 0xD0;

sbit CY = PSW^7;

bit YesOrNo;        // 佔用bdata區的一個位

Global

• global variables (file scope)

Static

• Static local variables (present when the function is called again)

Example:

static int x = 0;

external