GENERAL DESCRIPTION
The W536A031, a member of ViewTalkTM family, is a high-performance 4-bit micro-controller (uC) with built-in speech unit, melody unit and 64seg * 16 com LCD driver unit which includes internal regulator, pump circuit and dedicated two pages LCD RAM. The 4-bit uC core contains dual clock source, 4-bit ALU, two 8-bit timers, one 14 bits divider, 16 pads for input or output, 8 interrupt sources and 8-level nesting for subroutine/interrupt applications.

FEATURES
• Operating voltage: 2.4 volt ~ 5.5 volt
• Watch dog disabled/enabled by mask option
• Dual clock operating system
   − Main clock with Ring/Crystal (400 KHz to 4 MHz)
   − Sub-clock with 32.768 KHz RC/Crystal by mask option
• Memory
   − Program ROM (P-ROM): 32K × 20 (ROM Bank0, 1, 2)
   − Data RAM (W-RAM): 1.4K × 4 bit
      (RAM Bank 0 is 896 nibbles from 0:000 ~0:37F and 0:380~0:3FF are mapped to special register.
      RAM Bank F is 512 nibbles from F: 200 ~F: 3FF either data RAM or dedicated to script kernel)
   − LCD RAM (L-RAM): 256× 4 bit × 2 pages (RAM Bank1, 2 from 200~2FF)
• 16 input/output pads
   − Ports for input only: 8 pads (RC, RD port; RD1~3 can share as serial bus for external memory W55XXX interface @W536A031)
   − Ports for Input/output: 8 pads (RA and RB port; RB port is available)
• Power-down mode
   − Hold mode (except for 32kHz oscillator)
   − Stop mode (including 32kHz oscillator and release by RD or RC port)
• Eight types of interrupts
   − Five internal interrupts (Divider, Timer 0, Timer 1, Speech, Meloy)
   − Three external interrupts (Port RC, RD, RA)
• One built-in 14-bit clock frequency divider circuit
• Two built-in 8-bit programmable countdown timers
   − Timer 0: one of two clock sources (FOSC/4 or FOSC/1024) can be selected
   − Timer 1: built-in auto-reload function includes internal timer, external event counter from RC.0
• Built-in 18/14-bit watchdog timer for system reset.
• Powerful instruction sets
• 8-level subroutine (including interrupt) nesting
• LCD driver unit capability
   − VLCD higher than (VDD-0.5V)
   − Built-in voltage regulator to V2 pad
   − 64 seg × 16 com
   − 1/16 or 1/8 duty, 1/5 or 1/4 bias, internal pump circuit option by special register
   − COM 8~ 15 and SEG40~63 can be shared as general input/output by special register
   − Either uC ROM or voice ROM used as LCD picture
• Speech function
   − Provided 1M bits Voice ROM for W536A031 based on 5 bits MDPCM algorithm
   − Voice ROM (V-ROM) available for uC data or LCD picture data.
   − Maximum 8*256 Label/Interrupt vector (voice section number) available
   − Provide two types of speech busy flag to either each GO or each trigger
   − Maximum up to 16M bits speech address capability interface with external memory W55XXX through serial bus.
• Melody function
   − Provide 1K notes (22bits/note) dedicated melody ROM
   − Provide two types of melody busy flag to uC either each note or each song
   − Provide 6 kinds of beat, 16 kinds of tempo, and pitch range from G3# to C7
   − Tremolo, triple frequency and 3 kinds of percussion available
   − Maximum 31 songs available
• Can mix speech with melody
• Multi-engine controller
• Direct driving speaker/buzzer or DAC output
• Chip On Board available