C501_1 Datasheet, PDF (7/121 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller

Introduction
C501
1 Introduction
The C501-L, C501-1R, and C501-1E described in this document are compatible (also pin-
compatible) with the 80C52 and can be used in typical 80C52 applications.
The C501-1R contains a non-volatile 8K×8 read-only program memory, a volatile 256×8 read/write
data memory, four ports, three 16-bit timers/counters, a seven source, two priority level interrupt
structure and a serial port. The C501-L is identical, except that it lacks the program memory on
chip. The C501-1E contains a one-time programmable (OTP) program memory on chip. The term
C501 refers to all versions within this specification unless otherwise noted.
Power
Saving
Modes
T0
T2
T1
RAM
256 x 8
Port 0
Ι/O
Port 1
Ι/O
CPU
USART
Port 2
Ι/O
8K x 8 ROM (C501-1R)
8K x 8 OTP (C501-1E)
Port 3
Ι/O
MCA03238
Figure 1-1
C501G Functional Units
Semiconductor Group
1-1