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TSC51C1XXX-A-16CIR датащи(PDF) 7 Page - TEMIC Semiconductors

номер детали TSC51C1XXX-A-16CIR
подробное описание детали  8-Bit Microcontroller for Digital Computer Monitors
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производитель  TEMIC [TEMIC Semiconductors]
домашняя страница  http://www.temic.de
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TSC8051C1
Rev. D (14 Jan. 97)
7
MATRA MHS
6.1.2. 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 are saved during
power down mode. A hardware reset is the only way of
exiting the power down mode. The hardware reset
initiates the Special Function Register. In the Power
Down mode, VCC may be lowered to minimize 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 frees the oscillator.
Reset should not be released until the oscillator has
restarted and stabilized. 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 transistor.
Table 1. Status of the external pins during Idle and Power Down modes.
Mode
Program
Memory
ALE
PSEN
Port 0
Port 1
Port 2
Port 3
PWMx
Idle
Internal
1
1
Port Data
Port Data
Port Data
Port Data
Floating
Idle
External
1
1
Floating
Port Data
Address
Port Data
Floating
Power Down
Internal
0
0
Port Data
Port Data
Port Data
Port Data
Floating
Power Down
External
0
0
Floating
Port Data
Port Data
Port Data
Floating
6.2. Stop Clock Mode
Due to static design, the TSC8051C1 clock speed can be
reduced down to 0 MHz without any data loss in memory
or register. This mode allows step by step code
execution, and permits to reduce system power
consumption by bringing the clock frequency down to
any value. When the clock is stopped, the power
consumption is the same as in the Power Down Mode.
6.3. I/O Ports Structure
The TSC8051C1 has four 8–bit ports. Each port consist
of a latch (special function register P0 to P3), an input
buffer and an output driver. These ports are the same as
in 80C51, with the exception of the additional functions
of port 1 and port 3 (see Pin Description section).
6.4. I/O Configurations
Figure 4. shows a functional diagram of the generic bit
latch and I/O buffer in each of the four ports. The bit
latch, (one bit in the port SFR) is represented as a D type
flip–flop. A ‘write to latch’ signal from the CPU latches
a bit from the internal bus and a ‘read latch’ signal from
the CPU places the Q output of the flip–flop on the
internal bus. A ‘read pin’ signal from the CPU places the
actual pin logical level on the internal bus.
Some instructions that read a port read the actual pin,
and other instructions read the latch (SFR).


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