DESCRIPTION

The SM8521 is a CMOS 8-bit single-chip micro-

computer containing SM85CPU core and the required

peripheral functions for dot matrix LCD display

system. SM85CPU is an 8-bit High performance CPU

with various addressing modes and High-efficiency

instruction sets. SM85CPU is featured by allocating

general registers on RAM to reduce overhead when

calling subroutines.

The peripheral functions and memory of SM8521

contain ROM, RAM, MMU, LCD controller, DMA,

sound generator, timer, serial interface (UART) and

PIO.

FEATURES

• ROM capacity : 4 096 x 8 bits

• RAM capacity : 1 024 x 8 bits

• External memory expansion

• A RAM area is used as subroutine stack

• CPU core :

• 8 bits x 8 ports (or 16 bits x 4 ports) and 16

bits x 4 ports general purpose register are

used as accumulator, register pointer, and

register index.

• Instruction sets

67

(multiplication/division/bit manipulation instruc-

tion)

• Addressing mode

23 types

• System clock cycle 0.2 µs (MIN.) at 10 MHz

main clock cycle

• System clock is variable by software (system

clock can be optioned to 1/2, 1/4, 1/8, 1/16,

1/32 of main-clock and 1/2 of sub-clock.)

• Built-in main clock oscillator for system clock

• Built-in sub clock oscillator for real time clock

• Interrupts :

Non-maskable interrupts

x 2

Maskable interrupts

x 8

• Standby modes : Halt mode/Stop mode

• I/O ports : Input/output

32

• Timer :

8 bits x 2 (with 8 bits prescaller)

Clock timer x 1 (1 s or 1 min)

Watchdog timer

• MMU :

In each 8 k-byte unit, external memory can be

expanded up to MAX. 2 M bytes.

• LCD controller :

Display size 160 x 100 dots

160 x 160 dots

160 x 200 dots

200 x 100 dots

200 x 160 dots

black & white 4 gradations

(interframe elimination)

VRAM

160 x 200 dot x 2 phases or

200 x 160 dot x 2 phases

(required externally)

• DMA :

Transmission mode : ROM to VRAM,

VRAM to VRAM,

Extend RAM to VRAM,

VRAM to Extend RAM

Transmission data : Rectangle (Arbitrary size)

• Sound generator :

Arbitrary waveform x 2 (16-level tone, 32-

step/1-period waveform output)

Noise x 1 channel

• PIO :

I/O

8-bit x 4

(In each 2 bits, I/O, pull-up and open-drain

can be set.)

IR carrier generator built-in.

• UART :

1 channel

Baud rate : Timer 0 output only (Timer 0

output/32)

SM8521

SM8521

8-Bit Single-Chip Microcomputer

(Controller For Hand-Held Equipment)

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In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in catalogs, data books,

etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.