DS89C420_02 Datasheet, PDF (3/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

Figure 1. BLOCK DIAGRAM
DS89C420
Control &
Sequencer
Internal
Registers
Decoder
IR
Internal Control Bus
Interrupt
CPU
SFRs
DPTR
DPTR1
SP
PC
AR Inc
AR
Address Bus
Serial I/O
Timer /
Counters
Watchdog Timer
&
Power Manager
Clock &
Reset
1Kx 8
RAM
16K x 8
Flash
I/O Ports
Memory
Control
ROM
Loader
P0 P1 P2 P3
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