W681308
XXXX PRODUCT DESCRIPTION
8.
8.1
Microcontroller
Features
8-bit Turbo 8051 Microcontroller with 12/24/48 MHz speed
256 bytes of on chip internal data RAM and 1K bytes external data RAM
Instruction set compatible with Nuvoton Turbo 8051
Three 8-bit I/O ports
Three 16-bit timers
One Full-duplex serial port
On-Chip debugger via JTAG (Joint Test Access Group) port
7 interrupt sources with two level priorities
Programmable Watchdog Timer
Two 16-bit data pointers
On Chip 8 KB OTP (One time programmable) memory
8.2
Memory Organization
8.2.1
Program Memory
On-chip 8k OTP Memory:
All instructions are fetched for execution from this memory area. The MOVC instruction can also access this memory region.
8.2.2
Data Memory
The MCU can access 1K bytes of external Data Memory. This memory region is accessed by the MOVX instruction.
Additionally it has 256 bytes on chip RAM which can be accessed either by direct addressing or by indirect addressing.
Some Special Function Registers (SFRs) can only be accessed by direct addressing.
F F
1 F F F
Indirect RAM
Addressing
SFRs Direct
Addressing only
8K Byte
OPT Internal
ROM
8 0
7 F
Direct&Indirect
Addressing
33 F F
3 0 0 0
1K Byte
RAM
0 0
0 0 0 0
21
Rev1.2
NUVOTEM TALEMA [ NUVOTEM TALEMA ]
