Microcomputer Components
8-Bit CMOS Microcontroller
C540U / C541U
Data Sheet 10.97
C540U/C541U Data Sheet
Revision History :
Previous Releases :
Page / Chapters
1997-10-01
none (Original Version)
Subjects (changes since last revision)
Edition 1997-10-01
Published by Siemens AG,
Bereich Halbleiter, Marketing-
Kommunikation, Balanstraße 73,
81541 München
©
Siemens AG 1997.
All Rights Reserved.
Attention please!
As far as patents or other rights of third parties are concerned, liability is only assumed for components, not for applications, processes
and circuits implemented within components or assemblies.
The information describes the type of component and shall not be considered as assured characteristics.
Terms of delivery and rights to change design reserved.
For questions on technology, delivery and prices please contact the Semiconductor Group Offices in Germany or the Siemens Companies
and Representatives worldwide (see address list).
Due to technical requirements components may contain dangerous substances. For information on the types in question please contact
your nearest Siemens Office, Semiconductor Group.
Siemens AG is an approved CECC manufacturer.
Packing
Please use the recycling operators known to you. We can also help you – get in touch with your nearest sales office. By agreement we will
take packing material back, if it is sorted. You must bear the costs of transport.
For packing material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs in-
curred.
Components used in life-support devices or systems must be expressly authorized for such purpose!
Critical components
1
of the Semiconductor Group of Siemens AG, may only be used in life-support devices or systems
2
with the express
written approval of the Semiconductor Group of Siemens AG.
1 A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the
failure of that life-support device or system, or to affect its safety or effectiveness of that device or system.
2 Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain hu-
man life. If they fail, it is reasonable to assume that the health of the user may be endangered.
8-Bit CMOS Microcontroller
C540U
C541U
Advance Information
•
•
•
•
•
Enhanced 8-bit C500 CPU
– Full software/toolset compatible to standard 80C51/80C52 microcontrollers
12 MHz external operating frequency
– 500 ns instruction cycle
Built-in PLL for USB synchronization
On-chip OTP program memory
– C540U : 4K byte
– C541U : 8K byte
– Alternatively up to 64K byte external program memory
– Optional memory protection
On-chip USB module
– Compliant to USB specification
– Full speed or low speed operation
– Five endpoints : one bidirectional control endpoint
four versatile programmable endpoints
– Registers are located in special function register area
– On-chip USB transceiver
On-Chip Emulation Support Module
Oscillator
Watchdog
Watchdog
Timer
SSC
T0
RAM
256 x 8
Port 0
I/O
Port 1
CPU
I/O
Power
Saving
Modes
USB
Module
USB Transceiver
D+
D-
T1
OTP Prog. Memory
C540U : 4 k x 8
C541U : 8 k x 8
Port 2
I/O
Port 3
I/O
The shaded units are not available in the C540U.
MCA03373
Semiconductor Group
3
1997-10-01
C540U
C541U
Features (cont’d) :
•
•
•
•
•
•
•
•
•
•
•
•
Up to 64K byte external data memory
256 byte on-chip RAM
Four parallel I/O ports
– P-LCC-44 package : three 8-bit ports and one 6-bit port
– P-SDIP-52 package : four 8-bit ports
– LED current drive capability for 3 pins (10 mA)
Two 16-bit timer/counters (C501 compatible)
SSC synchronous serial interface (SPI compatible) (only C541U)
– Master and slave capable
– Programmable clock polarity / clock-edge to data phase relation
– LSB/MSB first selectable
– 1.5 MBaud transfer rate at 12 MHz operating frequency
7 interrupt sources (2 external, 5 internal with 2 USB interrupts) selectable at 2 priority levels
Enhanced fail safe mechanisms
– Programmable watchdog timer (only C541U)
– Oscillator watchdog
Power saving modes
– idle mode
– software power down mode with wake-up capability through INT0 pin or USB
On-chip emulation support logic (Enhanced Hooks Technology
TM
)
P-LCC-44 and P-SDIP-52 packages
Power supply voltage range : 4.0V to 5.5V
T
A
= 0 to 70
°
C
Temperature Range :
SAB-C540U
T
A
= 0 to 70
°
C
SAB-C541U
Table 1
Ordering Information
Type
SAB-C540U-EN
SAB-C540U-EP
SAB-C541U-1EN
SAB-C541U-1EP
Ordering Code
Q67126-C2042
Q67120-C2043
Q67126-C2001
Q67120-C2021
Package
P-LCC-44-2
P-SDIP-52-1
P-LCC-44-2
P-SDIP-52-1
Description
(8-Bit CMOS microcontroller)
8-Bit CMOS microcontroller (12 MHz)
8-Bit CMOS microcontroller (12 MHz)
8-Bit CMOS microcontroller (12 MHz)
8-Bit CMOS microcontroller (12 MHz)
Semiconductor Group
4
1997-10-01
C540U
C541U
V
CC
V
SS
XTAL2
XTAL1
ALE
PSEN
EA
RESET
D+
D-
C540U
C541U
Port 0
8-Bit Digital I / O
Port 1
P-LCC-44 : 6-Bit Digital I / O
P-SDIP-52 : 8-Bit Digital I / O
Port 2
8-Bit Digital I / O
Port 3
8-Bit Digital I / O
MCL03374
Figure 2
Logic Symbol
Additional Literature
For further information about the C540U/C541U the following literature is available :
Title
C540U/C541U 8-Bit CMOS Microcontroller User’s Manual
C500 Microcontroller Family
Architecture and Instruction Set User’s Manual
C500 Microcontroller Family - Pocket Guide
Ordering Number
B158-H????-X-X-7600
B158-H6987-X-X-7600
B158-H6986-X-X-7600
Semiconductor Group
5
1997-10-01
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