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

Introduction
C541U
1 Introduction
The C541U is a member of the Siemens C500 family of 8-bit microcontrollers They are fully
compatible to the standard 80C51 architecture.
The C541U especially provides an on-chip USB module compliant to the USB specification, which
is capable to operate either in low or full speed mode. The five endpoints can be easily controlled
by the CPU via special function registers. Due to the on-chip USB transceiver circuits the C541U
can be directly connected to the USB bus.
Figure 1-1 shows the different functional units of the C541U and figure 1-2 shows the simplified
logic symbol of the C541U.
Oscillator _Watchdog
Watchdog _Timer
RAM
256 × 8
Port 0
I/O
SSC
T0
Port 1
I/O
CPU
Power
Saving
USB
T1
Modes
Module
Port 2
I/O
OTP Prog. Memory
8k×8
Port 3
I/O
USB Transceiver
D+ D-
Figure 1-1
C541U Functional Units
Semiconductor Group
1-1
1997-10-01