
HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
CONTENTS
DEVICE NAMING STRUCTURE ...........................................................................1
HMS99C51S/52S/54S/56S/58S SELECTION GUIDE ..........................................1
FEATURE ..............................................................................................................2
PIN CONFIGURATION .........................................................................................4
PIN DEFINITIONS AND FUNCTIONS ..................................................................8
FUNCTIONAL DESCRIPTION ............................................................................11
CPU .....................................................................................................................12
SPECIAL FUNCTION REGISTERS ....................................................................13
X2 MODE ............................................................................................................19
TIMER / COUNTER 0 AND 1 ..............................................................................21
TIMER 2 ..............................................................................................................22
SERIAL INTERFACE (UART) .............................................................................23
INTERRUPT SYSTEM ........................................................................................24
POWER SAVING MODES ..................................................................................26
ELECTRICAL CHARACTERISTICS ...................................................................27
OSCILLATOR CIRCUIT ......................................................................................39
FLASH MEMORY ................................................................................................43
IN-SYSTEM PROGRAMMING (ISP) ...................................................................55
ISP METHOD FOR PC (MAGNACHIP WINISP) .................................................66