RDC
®
RISC DSP Communication
R8820I
16-Bit RISC Microcontroller
2. Block Diagram
INT2/INTA0_n
INT1/SELECT_n
CLKOUTA
INT3/INTA1_n/IRQ
CLKOUTB INT6~4
INT0 NMI
TMROUT0 TMROUT1
TMRIN0
TMRIN1
DRQ0
DRQ1
X1
VCC
GND
X2
Clock and
Power
Management
Interrupt
Control Unit
Timer Control
Unit
DMA
Unit
RST_n
LCS_n/ONCE0_n
MCS3_n/RFSH_n
MCS[2:0]
UCS_n/ONCE1_n
PCS3_n~PCS0_n
PCS5_n/A1
PCS6_n/A2
Chip
Select
Unit
PSRAM
Control
Unit
Instruction
Queue (64bits)
Instruction
Decoder
Control Signal
Micro
ROM
PIO
Unit
PIO[31:0]
ARDY
SRDY
S2_n~S0_n
DT/R_n
DEN_n
Refresh
Control
Unit
Register
File
General,
Segment,
Eflag Register
EA / LA
Address
Asynchro-
nous Serial
Port0
RTS0_n/RTR0_n
CTS0_n/ENRX0_n
TXD0
RXD0
RTS1_n/RTR1_n
HOLD
HLDA
S6/CLKDIV2_n
UZI_n
Bus
Interface
Unit
ALU
(Special,
Logic,
Adder,
BSF)
Execution
Unit
Asynchro-
nous Serial
Port1
CTS1_n/ENRX1_n
TXD1
RXD1
A[19:0]
AD[15:0]
ALE
RD_n
WHB_n
WLB_n
WR_n
BHE_n/ADEN_n
Specifications subject to change without notice, contact your sales representatives for the most update information.
Page
3
of
9
REV 1.0
May. 31 2007
RDC [ RDC SEMICONDUCTOR ]
