C541U_99 Datasheet, PDF (16/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

Fundamental Structure
C541U
2 Fundamental Structure
The C541U is fully compatible to the architecture of the standard 8051/C501 microcontroller family.
While maintaining the typical architectural characteristics of the C501, the C541U incorporates a
SSC synchronous serial interface, a versatile USB module as well as some enhancements in the
Fail Save Mechanism Unit.
Figure 2-1 shows a block diagram of the C541U.
XTAL2
XTAL1
ALE
PSEN
EA
RESET
D+
D-
Oscillator Watchdog
OSC & Timing
RAM
256 x 8
CPU
Progr. Watchdog
Timer
Timer 0
Timer 1
SSC (SPI) Interface
PLL
USB
Module
Interrupt Unit
OTP
Memory
8k x 8
Emulation
Support
Logic
Port 0
Port 1
Port 2
Port 3
Port 0
8-bit digit. I/O
Port 1
6-bit digit. I/O
Port 2
8-bit digit. I/O
Port 3
8-bit digit. I/O
C541U
Figure 2-1
Block Diagram of the C541U
Semiconductor Group
2-1
1997-10-01