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IA80C152
Preliminary Data Sheet
UNIVERSAL COMMUNICATIONS CONTROLLER
Table 6 - Power Conservation Modes
Program
Fetch
P0, P2
Port
0
Float
Port
1
Data
Port
2
Addr.
Port
3
Data
Port
4
Data
Port
5*
0FFh
Port
6*
0FFh
Mode
Idle
ALE PSEN EPSEN*
1
1
0
0
1
1
0
1
1
1
1
0
P5, P6*
P0, P2
Data
Float
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
0FFh
0FFh
0FFh
Addr.
0FFh
0FFh
Power
Down
P5, P6*
*JB and JD Versions Only
Oscillator Pins
There are 2 methods for providing a clock to the 80C152. One method is to provide a crystal
oscillator and the other method is to provide an external clock source. When providing a crystal
oscillator, the XTAL1 pin is the input and XTAL2 is the output. The min and max crystal
frequencies are 3.5 MHz and 16.5 MHz, respectively.
When providing an external clock source, XTAL1 is the input and XTAL has no connection. Duty
cycle does not matter to the device, however, the external clock source requires a minimum pulse
width of 20 ns.
Summary of the 8051 Instruction Set
Table 7 provides a summary of the instruction set organized by hexadecimal opcode. Please refer
to the original Intelä Data Book for individual instruction set details.
Copyright ã 2000
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