C501_1 Datasheet, PDF (17/121 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller

Fundamental Structure
C501
2 Fundamental Structure
The C501 is fully compatible to the standard 8051 microcontroller family.
It is compatible with the 80C32/52/82C52. While maintaining all architectural and operational
characteristics of the 8051 microcontroller family, the C501 incorporates some enhancements in the
timer 2 and fail save mechanism unit.
Figure 2-6 shows a block diagram of the C501.
V _CC
V _SS
XTAL1
XTAL2
RESET
ALE/PROG
PSEN
EA/V_PP
C501
OSC & Timing
CPU
Timer 0
Timer 1
Timer 2
Interrupt Unit
Serial Channel
(USART)
Figure 2-6
Block Diagram of the C501
RAM
256 x 8
C501-1R : ROM
C501-1E : OTP
8K x 8
Port 0
Port 1
Port 2
Port 3
Port 0
8-Bit Digit. Ι /O
Port 1
8-Bit Digit. Ι /O
Port 2
8-Bit Digit. Ι /O
Port 3
8-Bit Digit. Ι /O
MCB03219
Semiconductor Group
2-1