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C505L

First 8051 Microcontroller with On-Chip LCD

Siemens AG 

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C505L

First 8051 Microcontroller

with On-Chip LCD

The C505L enhances the C500

family of 8-bit Microcontrollers

by a new member which provides

on-chip LCD.

The device provides 32 KByte of

OTP, 512 Bytes of RAM, LCD,

an asynchronous/synchronous

serial interface and a highly

accurate 10-bit ADC with a 6 µs

conversion time integrated

on-chip.

Typical applications for the C505L

are electricity meters, utility

meters, intelligent terminals and

controllers. This device has several

power saving modes, including

one in which the on-chip RTC is

functioning with a typical power

consumption of 50 µA at 3 V.

• Enhanced 8-Bit C500-CPU –

fully software/toolset compati-

ble to standard 80C51/80C52

Microcontrollers

• 300 ns instruction cycle time

at 20 MHz CPU clock without

clock prescaler

• Eight 16 Bit datapointers for

indirect addressing of program

and data memory

• Supports external address

range up to 64 KByte program

and data memory

• Full duplex serial interface with

asynchronous and synchronous

modes and programmable bau-

drate generator

• 32 KByte On-chip OTP memory

(C505L-4E only)

• 256 Byte On-chip RAM

• 256 Byte On-chip XRAM

• Five 8-bit and one 6-bit digital

I/O ports (Port 5 with 6 bits

only)

• Three 16-bit timers/counters

• 128-segment LCD controller

– 1/4 duty cycle drive

– 4 row and 32 column outputs

– On-chip programmable

reference voltage generation

– 20 dedicated LCD output lines

(4 rows + 16 columns)

– Option to switch 16 LCD

output lines for digital I/O

(2 sets of 8 lines each)

• Real-time clock

– 47-bit digital clock counter

(40 bits readable)

– External crystal oscillator

of frequency 32.768 KHz

required

• Full duplex serial interface

with programmable baudrate

generator (USART)

• 10-bit A/D converter with 8

multiplexed inputs

• 6 µs conversion time

• Twelve interrupt sources with

four priority levels

• On-chip emulation support logic

(Enhanced Hooks)

• Programmable 15-bit

watchdog timer

• Oscillator watchdog

• Fast power on reset

• Power saving modes

• P-MQFP-80 package

• Temperature ranges:

SAB-C505L TA = 0 to 70°C

SAF-C505L TA = –40 to 85°C

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