SM8521

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 instruction)
• 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)


Pinout




Specifications

PARAMETER	SYMBOL	CONDITION	RATING	UNIT
Supply voltage	VDD		0.3 to 6.5	V
Input voltage	VI		0.3 to VDD + 0.5	V
Output voltage	VO		0.3 to VDD + 0.5	V
Output current	IOH	High-level output current	4	mA
	IOL	Low-level output current	4	mA
Operating temperature	TOPR		10 to +60
Store temperature	TSTG		40 to +140

Description

The SM8521 is a CMOS 8-bit single-chip microcomputer 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.