W681308DG Datasheet, PDF (21/64 Pages) Nuvotem Talema – W681308 USB Audio Controller from Nuvoton integrates fast 8051 Microcontroller Unit (MCU)

W681308
XXXX PRODUCT DESCRIPTION
8.
Microcontroller
8.1
Features
ƒ 8-bit Turbo 8051 Microcontroller with 12/24/48 MHz speed
ƒ 256 bytes of on chip internal data RAM and 1K bytes external data RAM
ƒ Instruction set compatible with Nuvoton Turbo 8051
ƒ Three 8-bit I/O ports
ƒ Three 16-bit timers
ƒ One Full-duplex serial port
ƒ On-Chip debugger via JTAG (Joint Test Access Group) port
ƒ 7 interrupt sources with two level priorities
ƒ Programmable Watchdog Timer
ƒ Two 16-bit data pointers
ƒ 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.
FF
Indirect RAM _{SFRs Direct}
Addressing _{Addressing only}
80
7F
Direct&Indirect
Addressing
00
33 F F
3000
1K Byte
RAM
1FFF
8K Byte
OPT Internal
ROM
0000
21
Rev1.2