AT89S51 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT89S51' PDF : 32 Pages View PDF
4.11 XTAL1
4.12 XTAL2
EA should be strapped to VCC for internal program executions.
This pin also receives the 12-volt programming enable voltage (VPP) during Flash programming.
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting oscillator amplifier
5. Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
Table 5-1.
Note that not all of the addresses are occupied, and unoccupied addresses may not be imple-
mented on the chip. Read accesses to these addresses will in general return random data, and
write accesses will have an indeterminate effect.
6 AT89S51
2487D–MICRO–6/08
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