Fundamental Structure
C513AO
User’s Manual
2-1
05.99
2
Fundamental Structure
The C513AO family of microcontrollers is based on the C501 architecture. Therefore, they are also
fully compatible with the industry-standard 8051 microcontrollers. The synchronous serial channel
and the external memory (XRAM) are important features of the C513AO not found in the C501.
Figure 2-1 illustrates the major blocks of the C513AO device.
Figure 2-1
Block Diagram of the C513AO
MCB04011
Oscillator
Watchdog
OSC & Timing
CPU
Timer 0
Timer 1
Timer 2
Interrupt Unit
USART
SSC
XRAM
256 byte
RAM
256 byte
ROM/OTP
16 K x 8
Port 0
Port 1
Port 2
Port 3
Emulation
Support
Logic
Port 0
8-Bit
Digital I/O
C513AO
V
DD
V
SS
XTAL1
XTAL2
RESET
ALE
PSEN
EA
Port 1
8-Bit
Digital I/O
Port 2
8-Bit
Digital I/O
Port 3
8-Bit
Digital I/O
