80C562 Datasheet, PDF (6/20 Pages) NXP Semiconductors – Single-chip 8-bit microcontroller

Philips Semiconductors
Single-chip 8-bit microcontroller
Product specification
80C562/83C562
OSCILLATOR
CHARACTERISTICS
XTAL1 and XTAL2 are the input and output,
respectively, of an inverting amplifier. The
pins can be configured for use as an on-chip
oscillator, as shown in the logic symbol.
To drive the device from an external clock
source, XTAL1 should be driven while XTAL2
is left unconnected. There are no
requirements on the duty cycle of the
external clock signal, because the input to
the internal clock circuitry is through a
divide-by-two flip-flop. However, minimum
and maximum high and low times specified in
the data sheet must be observed.
RESET
A reset is accomplished by holding the RST
pin high for at least two machine cycles (24
oscillator periods), while the oscillator is
running. To ensure a good power-on reset,
the RST pin must be high long enough to
allow the oscillator time to start up (normally
a few milliseconds) plus two machine cycles.
At power-on, the voltage on V_DD and RST
must come up at the same time for a proper
start-up.
IDLE MODE
In the idle mode, the CPU puts itself to sleep
while all of the on-chip peripherals stay
active. The instruction to invoke the idle
mode is the last instruction executed in the
normal operating mode before the idle mode
is activated. The CPU contents, the on-chip
RAM, and all of the special function registers
remain intact during this mode. The idle
mode can be terminated either by any
enabled interrupt (at which time the process
is picked up at the interrupt service routine
and continued), or by a hardware reset which
starts the processor in the same manner as a
power-on reset.
POWER-DOWN MODE
In the power-down mode, the oscillator is
stopped and the instruction to invoke
power-down is the last instruction executed.
Only the contents of the on-chip RAM are
preserved. A hardware reset is the only way
to terminate the power-down mode. the
control bits for the reduced power modes are
in the special function register PCON. Table 1
shows the state of the I/O ports during low
current operating modes.
Table 1. External Pin Status During Idle and Power-Down Modes
MODE
PROGRAM
MEMORY
ALE
PSEN
PORT 0 PORT 1
Idle
Internal
1
1
Data
Data
Idle
External
1
1
Float
Data
Power-down
Internal
0
0
Data
Data
Power-down
External
0
0
Float
Data
PORT 2
Data
Address
Data
Data
PORT 3
Data
Data
Data
Data
PORT 4
Data
Data
Data
Data
PWM0/
PWM1
High
High
High
High
ABSOLUTE MAXIMUM RATINGS^{1, 2, 3}
PARAMETER
RATING
UNIT
Voltage on any other pin to V_SS
Input, output DC current on any single I/O pin
–0.5 to +6.5
V
5.0
mA
Power dissipation (based on package heat transfer limitations, not device power consumption)
1.0
W
Storage temperature range
–65 to +150
°C
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section
of this specification is not implied.
2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.
3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V_SS unless otherwise
noted.
1992 Jan 08
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