C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 7

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

1
The C505 microcontroller is a member of the Siemens C500 family of 8-bit microcontrollers. The
C505 is fully compatible to the standard 8051 microcontroller. Additionally the C505 provides
extended power save provisions, on-chip RAM, 16K of on-chip program memory, and RFI related
improvements. The C505 does not have an internal clock prescaler and with a maximum external
clock rate of 20 MHz it achieves a 300 ns instruction cycle time.
The C505-2R operates with internal and/or external program memory. The C505-L is identical to the
C505-2R, except that it lacks the on-chip porgram memory. The C505C-2R and C505C-L, are
identical to the C505-2R and the C505-L respectively, except that they have, in addition, the full
CAN interface. Therefore, the term C505 refers to all the above four versions within this
documentation unless otherwise noted.
Figure 1-1 shows the different functional units of the C505 and Figure 1-2 shows the simplified
logic symbol of the C505.
Figure 1-1
C505 Functional Units
Semiconductor Group
Introduction
C505C only
Watchdog Timer
Watchdog
8-Bit ADC
Controller
Oscillator
Full-CAN
Timer 2
T 0
T 1
256 x 8
XRAM
8 Datapointers
16k x 8
ROM
CPU
1-1
256 x 8
RAM
USART
8-Bit
Port 0
Port 2
Port 3
Port 4
Port 1
I / O
8 Analog Inputs /
8 Digit. I / O
I / O
I / O
I / O (2-Bit I / O Port)
C505 / C505C
Introduction
MCB03283
1997-08-01