
4. Central processing unit ABOV
A96G140/A96G148/A96A148 User’s manual
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Debug support (OCD and OCD II):
The M8051EW offers a Debug Mode together with a set of dedicated debug signals which can
be used by external debug hardware, OCD and OCD II, to provide start/stop program
execution in response to both hardware and software triggers, single step operation and
program execution tracing.
Separate Program and External Data Memory interfaces or a single multiplexed interface
—
Up to 1Mbyte of External Data Memory, accessible by selecting one from interfaces
—
Up to 256bytes of Internal Data Memory
—
Up to 1Mbyte of RAM or ROM Program Memory, accessible by selecting one from
interfaces
Support for synchronous and asynchronous Program, External Data and Internal Data
Memory
Wait states support for slow Program and External Data Memory.
16-bit Data Memory address is generated through the Data Pointer register (DPTR register).
16-bit program counter is capable of addressing up to Flash size in each device.
A single data pointer, two memory-mapped data pointers, or 2, 4 or 8 banked data pointers
Support for 2 or 4 level of priority scheme
–
up to 24 maskable Interrupt sources
External Special Function Register (SFR) are memory mapped into Direct Memory at the
address between 80 hex and FF hex.