saf-xc888cm-8ffi5v Infineon Technologies Corporation, saf-xc888cm-8ffi5v Datasheet - Page 26

• Manufacturer Part Number: saf-xc888cm-8ffi5v
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3
Chapter 3
3.1
The XC886/888 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 XC886/888 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 XC886/888 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 Special Function Registers (SFRs).
Figure 6
Figure 6
Data Sheet
Legacy External Interrupts (IEN0, IEN1)
shows the CPU functional blocks.
Non-Maskable Interrupt
provides an overview of the XC886/888 functional description.
Functional Description
Processor Architecture
Program Memory
External Interrupts
External Data
CPU Block Diagram
Memory Wait
Memory
Reset
f
CCLK
16-bit Registers &
Memory Interface
Opcode Decoder
State Machine &
Power Saving
Core SFRs
Immediate
Opcode &
Controller
Registers
Interrupt
19
Register Interface
Multiplier / Divider
Timer 0 / Timer 1
UART
ALU
Functional Description
XC886/888CLM
External SFRs
V1.1, 2009-01
Internal Data
Memory