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TSC80C51TXXX-L16MB Scheda tecnica(PDF) 6 Page - TEMIC Semiconductors

Il numero della parte TSC80C51TXXX-L16MB
Spiegazioni elettronici  CMOS 0 to 44 MHz Single-Chip 8 Bit Microcontroller
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Produttore elettronici  TEMIC [TEMIC Semiconductors]
Homepage  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

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TSC80C31/80C51
Rev. E (14 Jan.97)
6
MATRA MHS
The flag bits GF0 and GF1 may be used to determine
whether the interrupt was received during normal
execution or during the Idle mode. For example, the
instruction that writes to PCON.0 can also set or clear one
or both flag bits. When Idle mode is terminated by an
enabled interrupt, the service routine can examine the
status of the flag bits.
The second way of terminating the Idle mode is with a
hardware reset. Since the oscillator is still running, the
hardware reset needs to be active for only 2 machine
cycles (24 oscillator periods) to complete the reset
operation.
Power Down Mode
The instruction that sets PCON.1 is the last executed prior
to entering power down. Once in power down, the
oscillator is stopped. The contents of the onchip RAM and
the Special Function Register is saved during power down
mode. The hardware reset initiates the Special Fucntion
Register. In the Power Down mode, VCC may be lowered
to mi-nimize circuit power consumption. Care must be
taken to ensure the voltage is not reduced until the power
down mode is entered, and that the voltage is restored
before the hardware reset is applied which freezes the
oscillator. Reset should not be released until the oscillator
has restarted and stabilized. A hardware reset is the only
way of exiting the power down mode.
Table 1 describes the status of the external pins while in
the power down mode. It should be noted that if the power
down mode is activated while in external program
memory, the port data that is held in the Special Function
Register P2 is restored to Port 2. If the data is a 1, the port
pin is held high during the power down mode by the
strong pullup, T1, shown in Figure 4.
Table 1. Status of the external pins during idle and power down modes.
MODE
PROGRAM MEMORY
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
1
Port Data
Port Data
Port Data
Port Data
Idle
External
1
1
Floating
Port Data
Address
Port Data
Power Down
Internal
0
0
Port Data
Port Data
Port Data
Port Data
Power Down
External
0
0
Floating
Port Data
Port Data
Port Data
Stop Clock Mode
Due to static design, the TSC80C31/80C51 clock speed
can be reduced until 0 MHz without any data loss in
memory or registers. This mode allows step by step
utilization, and permits to reduce system power
consumption by bringing the clock frequency down to
any value. At 0 MHz, the power consumption is the same
as in the Power Down Mode.
I/O Ports
The I/O buffers for Ports 1, 2 and 3 are implemented as
shown in Figure 4.
Figure 4. I/O Buffers in the TSC80C31/80C51 (Ports
1, 2, 3).


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