RSC4128 datasheet(18/49 Pages) ETC

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RSC-4128

Data Sheet

P/N 80-0206-J

Instruction

Opcode

Operand 1

Operand 2

Description

Bytes

Cycles

+Cycles/

Waitstate

MOV

dest

Source

MOV

@dest

Source

MOV

dest

@source

MOV

dest

#immed

immediate data to register

MOVC

dest

@source

code space to register

MOVC

@dest

Source

MOVX

dest

@source

data space to register

MOVX

@dest

Source

POP

dest

@++source

stack pop (source pre-

incremented)

PUSH

@dest--

Source

stack push (dest post-

decremented)

MOVY

dest

@source

RAMY to register, indirect

MOVY

@dest

source

MOVD

dest_pair

source_pair

16-bit MOV

*MOVX instructions will have the number of wait states selected by register FC.Bits[7:5], unless register D2.Bit4

and register D6.Bit5 are set, in which case the number of wait states is fixed at 4.

On-Chip ROM

The RSC-4128 includes integrated on-chip ROM. This ROM is enabled when the –XM pin is tied , or pulled high by

it’s own internal pullup resistor. This ROM space can combine both Code and Data.

ROM code Security Feature

The RSC-4128 has only one external memory enable pin (-XM), designed to prevent configuring code space for

both internal and external memory. This discourages executing external code that reads internal code via the

MOVC instruction and dumps it externally.

In this way, a substantial measure of security is provided for the

developer’s application code.

Oscillators

Two independent oscillators in the RSC-4128 provide a high-frequency oscillator (OSC1), and a 32 KHz time-

keeping and power-saving oscillator (OSC2). The oscillator characteristics are:

OSC

FREQ

PLL PINS

SOURCES

3.58 MHz 4X

XI1

XO1

Crystal

Ceramic resonator

32768 Hz N/A XI2

XO2

Crystal

Internal RC

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