saa-xc866 Infineon Technologies Corporation, saa-xc866 Datasheet - Page 16

• Manufacturer Part Number: saa-xc866
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3
3.1
The SAA-XC866 is based on a high-performance 8-bit Central Processing Unit (CPU)
that is compatible with the standard 8051 processor. While the standard 8051 processor
is designed around a 12-clock machine cycle, the SAA-XC866 CPU uses a 2-clock
machine cycle. This allows fast access to ROM or RAM memories without wait state.
Access to the Flash memory, however, requires an additional wait state (one machine
cycle). The instruction set consists of 45% one-byte, 41% two-byte and 14% three-byte
instructions.
The SAA-XC866 CPU provides a range of debugging features, including basic stop/start,
single-step execution, breakpoint support and read/write access to the data memory,
program memory and SFRs.
Figure 5
Data Sheet
Legacy External Interrupts (IEN0, IEN1)
Functional Description
Processor Architecture
Non-Maskable Interrupt
CPU Block Diagram
Program Memory
External Interrupts
External Data
Memory Wait
Memory
Reset
f
CCLK
Figure 5
16-bit Registers &
Memory Interface
Opcode Decoder
State Machine &
Power Saving
Core SFRs
Immediate
Opcode &
Controller
Registers
Interrupt
shows the CPU functional blocks.
12
Register Interface
Multiplier / Divider
Timer 0 / Timer 1
UART
ALU
Functional Description
SAA-XC866
External SFRs
Internal Data
V1.2, 2008-02
Memory