R8821

R

R

16-BIT RISC MICROCONTROLLER

Specifications subject to change without notice, contact your sales representatives for the most update information.

Page 3 of 5

REV 1.0 Jul.11 2006

2.

Block Diagram

DMA

Unit

DRAM

Control

Unit

Chip

Select

Unit

Refresh

Control

Unit

Bus

Interface

Unit

PIO

Unit

Timer Control

Unit

Interrupt

Control Unit

Clock and

Power

Management

Asynchro-

nous Serial

Port0

Instruction

Queue (64bits)

Instruction

Decoder

Register

File

General,

Segment,

Eflag Register

ALU

(Special,

Logic,

Adder,

BSF)

Micro

ROM

EA / LA

Address

Control Signal

Execution

Unit

X1

X2

CLKOUTA

CLKOUTB INT6-INT4

INT0

TMRIN0

TMROUT0

TMRIN1

TMROUT1

DRQ0

DRQ1

TXD0

RXD0

A[19:0](MA[8:0])

AD[15:0]

ALE

RD_n

VCC

GND

LCS_n/ONCE0_n/RAS0_n

UCS_n/ONCE1_n

PCS5_n/A1

PCS6_n/A2

ARDY

SRDY

S2_n/BWSEL

DT/R_n

DEN_n

HOLD

HLDA

S6/CLKDIV2_n

UZI_n

WR_n

BHE_n/ADEN_n

WLB_n

WHB_n

Asynchro-

nous Serial

Port1

RTS0_n/RTR0_n

CTS0_n/ENRX0_n

TXD1

RXD1

RTS1_n/RTR1_n

CTS1_n/ENRX1_n

INT1/SELECT_n

INT3/INTA1_n/IRQ

INT2/INTA0_n

NMI

RST_n

MCS1_n/UCAS_n

MCS2_n/LCAS_n

MCS0_n

MCS3_n/RAS1_n

S1_n~S0_n

PIO[31:0]