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参数资料
| 型号： | P80C528EFA |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-bit microcontrollers |
| 中文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 11/26页 |
| 文件大小： | 447K |
| 代理商： | P80C528EFA |
Philips Semiconductors
Product specification
80C528/83C528
CMOS single-chip 8-bit microcontrollers
1995 Feb 02
11
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 insure a good power-up 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-up, the voltage on V
DD
and RST must
come up at the same time for a proper
start-up.
IDLE MODE
In 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.
The power-down mode can be terminated by
a RESET in the same way as in the 80C51 or
in addition by one of two external interrupts,
INT0 or INT1. A termination with an external
interrupt does not affect the internal data
memory and does not affect the special
function registers. This makes it possible to
exit power-down without changing the port
output levels. To terminate the power-down
mode with an external interrupt INT0 or INT1
must be switched to level-sensitive and must
be enabled. The external interrupt input
signal INT0 and INT1 must be kept low until
the oscillator has restarted and stabilized. An
instruction following the instruction that puts
the device in the power-down mode will be
executed. A reset generated by the watchdog
timer terminates the power-down mode in the
same way as an external RESET, and only
the contents of the on-chip RAM are
preserved. The control bits for the reduced
power modes are in the special function
register PCON.
DESIGN CONSIDERATIONS
At power-on, the voltage on V
DD
and RST
must come up at the same time for a proper
start-up.
When the idle mode is terminated by a
hardware reset, the device normally resumes
program execution, from where it left off, up
to two machine cycles before the internal
reset algorithm takes control. On-chip
hardware inhibits access to internal RAM in
this event, but access to the port pins is not
inhibited. To eliminate the possibility of an
unexpected write when idle is terminated by
reset, the instruction following the one that
invokes idle should not be one that writes to a
port pin or to external memory.
Table 5 shows the state of I/O ports during
low current operating modes.
Table 5.
External Pin Status During Idle and Power-Down Modes
MODE
PROGRAM MEMORY
ALE
PSEN
PORT 0
PORT 1
PORT 2
PORT 3
Idle
Internal
1
1
Data
Data
Data
Data
Idle
External
1
1
Float
Data
Address
Data
Power-down
Internal
0
0
Data
Data
Data
Data
Power-down
External
0
0
Float
Data
Data
Data
相关PDF资料 |
PDF描述 |
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| P83C528EFA | 8-bit microcontrollers |
| P80C528EFB | 8-bit microcontrollers |
| P83C528EFB | 8-bit microcontrollers |
| P87C528EFBB | CMOS single-chip 8-bit microcontroller |
| P87C528EFFFA | CMOS single-chip 8-bit microcontroller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P80C528EFA/02 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:IC-SM-8-BIT MCU |
| P80C528EFB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers |
| P80C528EFP | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers |
| P80C528EHA | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P80C528EHP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
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