®
R8821
RISC DSP Communication
RDC
16-BIT RISC MICROCONTROLLER
2. Block Diagram
INT2/INTA0_n
INT1/SELECT_n
CLKOUTA INT3/INTA1_n/IRQ
TMROUT0 TMROUT1
DRQ0
DRQ1
CLKOUTBINT6-INT4
INT0 NMI
TMRIN0
TMRIN1
X2
X1
Interrupt
Control Unit
Timer Control
Unit
DMA
Unit
Clock and
Power
VCC
GND
Management
RST_n
LCS_n/ONCE0_n/RAS0_n
Chip
Select
Unit
Instruction
Queue (64bits)
UCS_n/ONCE1_n
MCS0_n
MCS1_n/UCAS_n
MCS2_n/LCAS_n
MCS3_n/RAS1_n
PCS5_n/A1
Instruction
Decoder
Micro
ROM
DRAM
Control
Unit
PIO
Unit
PIO[31:0]
PCS6_n/A2
Control Signal
Register
File
General,
EA / LA
Address
RTS0_n/RTR0_n
Asynchro-
nous Serial
Port0
CTS0_n/ENRX0_n
TXD0
Refresh
Control
Unit
Segment,
ARDY
SRDY
Eflag Register
S2_n/BWSEL
S1_n~S0_n
DT/R_n
RXD0
RTS1_n/RTR1_n
DEN_n
Bus
Interface
Unit
Asynchro-
nous Serial
Port1
CTS1_n/ENRX1_n
TXD1
ALU
(Special,
Logic,
Adder,
BSF)
HOLD
HLDA
Execution
Unit
S6/CLKDIV2_n
UZI_n
RXD1
RD_n
WHB_n
WLB_n
A[19:0](MA[8:0])
AD[15:0]
WR_n
BHE_n/ADEN_n
ALE
Specifications subject to change without notice, contact your sales representatives for the most update information.
Page 3 of REV 1.0 Jul.11 2006
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RDC [ RDC SEMICONDUCTOR ]
