4bit cpu voice 4位语音ic

(1) single power supply can operate from 2.2~5.5v at 4mhz or 3.6~5.5v at 8mhz.
(2) program rom: 16k x 10 bits
(3) 1 set of 16-bits dpr can access up to 64k x 10 bits melody data memory space, and 1 set of 18-bits
vpr can access up to 256k x 10 bits voice data memory space.

(4) data registers:
a). 128 x 4-bits data ram (00-7fh)
(4ec005x/4ec010x are 96 x 4-bits data ram 00-5fh)
b). unbanked special function registers (sfr) range: 00h-2fh
(5) i/o ports:
a). pra: 4-bits i/o port a (10h) can be programmed to input/output individually. (register control)
b). prb: 4-bits i/o port b (13h) can be configured to input/output individually. (mask option)
(6) on-chip clock generator: resistive clock drive (rm)
(7) timer: 1-set voice interrupt (timer0: a 9-bits auto-reload timer/counter).
(8) stack: 2-level subroutine nesting.
(9) built-in 4-level volume control can be programmed.
(10) built-in 8-level dac current output can be configured. (mask option)
(11) built-in ir carrier output: port b[1] can be configured as ir pin by 38k / 56khz. (mask option)

(12) external reset: port b[3] can be configured as reset pin. (mask opton)
(13) halt and release from halt function to reduce power consumption
(14) watch dog timer (wdt)
(15) instruction: 1-cycle instruction except for table read and program branches which are 2-cycles
(16) number of instruction: 27
(17) dac: 1 channel voice and dual tone melody synthesizer (one 9-bits cout or 8-bits pwm output).