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TSC80C31XXX-L16AI Datasheet(PDF) 5 Page - TEMIC Semiconductors

Part # TSC80C31XXX-L16AI
Description  CMOS 0 to 44 MHz Single-Chip 8 Bit Microcontroller
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Manufacturer  TEMIC [TEMIC Semiconductors]
Direct Link  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

TSC80C31XXX-L16AI Datasheet(HTML) 5 Page - TEMIC Semiconductors

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TSC80C31/80C51
Rev. E (14 Jan.97)
5
MATRA MHS
PSEN
Program Store Enable output is the read strobe to external
Program Memory. PSEN is activated twice each machine
cycle during fetches from external Program Memory.
(However, when executing out of external Program
Memory, two activations of PSEN are skipped during
each access to external Data Memory). PSEN is not
activated during fetches from internal Program Memory.
PSEN can sink or source 8 LS TTL inputs. It can drive
CMOS inputs without an external pullup.
EA
When EA is held high, the CPU executes out of internal
Program Memory (unless the Program Counter exceeds
3 FFFH). When EA is held low, the CPU executes only out
of external Program Memory. EA must not be floated.
XTAL1
Input to the inverting amplifier that forms the oscillator.
Receives the external oscillator signal when an external
oscillator is used.
XTAL2
Output of the inverting amplifier that forms the oscillator.
This pin should be floated when an external oscillator is
used.
Idle And Power Down Operation
Figure 3. shows the internal Idle and Power Down clock
configuration. As illustrated, Power Down operation
stops the oscillator. Idle mode operation allows the
interrupt, serial port, and timer blocks to continue to
function, while the clock to the CPU is gated off.
These special modes are activated by software via the
Special Function Register, PCON. Its hardware address is
87H. PCON is not bit addressable.
Figure 3. Idle and Power Down Hardware.
PCON : Power Control Register
(MSB)
(LSB)
SMOD
GF1
GF0
PD
IDL
Symbol
Position
Name and Function
SMOD
PCON.7
Double Baud rate bit. When set to
a 1, the baud rate is doubled when
the serial port is being used in
either modes 1, 2 or 3.
PCON.6
(Reserved)
PCON.5
(Reserved)
PCON.4
(Reserved)
GF1
PCON.3
General-purpose flag bit.
GF0
PCON.2
General-purpose flag bit.
PD
PCON.1
Power Down bit. Setting this bit
activates power down operation.
IDL
PCON.0
Idle mode bit. Setting this bit
activates idle mode operation.
If 1’s are written to PD and IDL at the same time. PD
takes, precedence. The reset value of PCON is
(000X0000).
Idle Mode
The instruction that sets PCON.0 is the last instruction
executed before the Idle mode is activated. Once in the
Idle mode the CPU status is preserved in its entirety : the
Stack Pointer, Program Counter, Program Status Word,
Accumulator, RAM and all other registers maintain their
data during idle. Table 1 describes the status of the
external pins during Idle mode.
There are three ways to terminate the Idle mode.
Activation of any enabled interrupt will cause PCON.0 to
be cleared by hardware, terminating Idle mode. The
interrupt is serviced, and following RETI, the next
instruction to be executed will be the one following the
instruction that wrote 1 to PCON.0.


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