GENERAL DESCRIPTION
The W536XXXT, a member of ViewTalkTM family, is a high-performance 4-bit micro-controller (uC) with built-in speech unit, melody unit and 64seg * 32 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, maximum 24 pads for input or output, 8 interrupt sources and 8-level nesting for subroutine/interrupt applications. Speech unit, integrated as a single chip with maximum 128 seconds (based on 6.4K sample rate with 5 bits MDPCM), is capable of expanding to 512 seconds speech addressed by external memory W55XXX with serial bus interface.

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): 64K × 20 (ROM Bank0, 1, 2, 3, 4, 5, 6)
    − 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): 512 × 4 bit × 2 pages (RAM Bank1, 2 from 200~3FF)
• Maximum 24 input/output pads
    − Ports for input only: 8 pads (RC, RD port; RD1~3 can share as serial bus for external memory W55XXX interface @W536030T/060T)
    − Ports for output only: 8 pads (RE & RF port; W536090T/120T available only)
    − Ports for Input/output: 8 pads (RA and RB port; RB port is available for W536090T /W536120T only)
• 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, Melody)
    − 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 × 32 com
    − 1/32 or 1/16 duty, 1/5 or 1/4 bias, internal pump circuit option by special register
    − COM24~ 31 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 / 2M/ 3M/ 4M bits Voice ROM for W536030T/060T/090T/120T 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