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| 型号： | P89C557E4 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Single-chip 8-bit microcontroller(单片8位微控制器) |
| 中文描述： | 单芯片8位微控制器（单片8位微控制器） |
| 文件页数： | 8/72页 |
| 文件大小： | 525K |
| 代理商： | P89C557E4 |
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Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
8
5.
ELECTROMAGNETIC COMPATIBILITY (EMC)
IMPROVEMENTS
Primary attention was paid on the reduction of electromagnetic
emission of the microcontroller P8xC557E4.
The following features effect in reducing the electromagnetic
emission and additionally improve the electromagnetic susceptibility:
Four supply voltage pins (V
DD
) and four ground pins (V
SS
) with
pairs of V
DD
and V
SS
at two adjacent pins at each side of the
package.
Separated V
DD
pins for the internal logic and the port buffers
Internal decoupling capacitance improves the EMC radiation
behavior and the EMC immunity
External capacitors are to be located as close as possible
between pins V
DD1
and V
SS1,
V
DD2
and V
SS2,
V
DD3
and V
SS3
as
well as V
DD4
and V
SS4
; ceramic chip capacitors are
recommended (100nF).
Useful in applications that require no external memory or temporarily
no external memory:
The ALE output signal (pulses at a frequency of f
CLK
/6) can be
disabled under software control (bit 5 in the SFR PCON: “RFI”); if
disabled, no ALE pulse will occur. ALE pin will be pulled down
internally, switching an external address latch to a quiet state.
The MOVX instruction will still toggle ALE (external data memory
is accessed). ALE will retain its normal HIGH value during Idle
Mode and a LOW value during Power-down mode while in the
“RFI” reduction mode. Additionally during internal access
(EA = 1) ALE will toggle normally when the address exceeds the
internal program memory size. During external access (EA = 0)
ALE will always toggle normally, whether the flag “RFI” is set or
not.
6.
FUNCTIONAL DESCRIPTION
6.1
The P8xC557E4 is a stand-alone high-performance microcontroller
designed for use in real time applications such as instrumentation,
industrial control, medium to high-end consumer applications and
specific automotive control applications.
General
In addition to the 80C51 standard functions, the device provides a
number of dedicated hardware functions for these applications.
The P8xC557E4 is a control-oriented CPU with on-chip program
and data memory. It can be extended with external program memory
up to 64 Kbytes. It can also access up to 64 Kbytes of external data
memory. For systems requiring extra capability, the P8xC557E4 can
be expanded using standard memories and peripherals.
The P8xC557E4 has two software selectable modes of reduced
activity for further power reduction – Idle and Power-down. The Idle
Mode freezes the CPU while allowing the RAM, timers, serial ports
and interrupt system to continue functioning. The Power-down Mode
saves the RAM contents but freezes the oscillator causing all other
chip functions to be inoperative. The Power-down Mode can be
terminated by an external Reset, by the seconds interrupt and by
any one of the two external interrupts. (See description Wake-up
from Power-down Mode.)
6.2
The central processing unit (CPU) manipulates operands in three
memory spaces; these are the 64 Kbytes external data memory,
1024 bytes internal data memory (consisting of 256 bytes standard
RAM and 768 bytes AUX-RAM) and the 32 Kbytes internal and/or
64 Kbytes external program memory (see Figure 4).
Memory organization
Program Memory
64 K
DIRECT AND
INDIRECT
Internal
Data Memory
External
64 K
Internal
(EA = 1)
External
(EA = 0)
255
127
0
Special
Function
Registers
Overlapped
Space
0
External
Data Memory
32768
32767
0
INDIRECT
ONLY
0
32767
768
(ARD = 1)
(ARD = 0)
AUXILIARY
RAM
Figure 4. Memory map & address space
相关PDF资料 |
PDF描述 |
|---|---|
| P83C557E4 | Single-chip 8-bit microcontroller(单片8位微控制器) |
| P80C557E4 | Single-chip 8-bit microcontroller(单片8位微控制器) |
| P89C557E6 | Single-chip 8-bit microcontroller(单片8位微控制器) |
| P80C557E6 | Single-chip 8-bit microcontroller(单片8位微控制器) |
| P89C58 | 80C51 8-bit microcontroller family 4K/8K/16K/32K Flash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P89C557E4EBB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P89C557E4EFB | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P89C557E4EFB/01,557 | 制造商:NXP Semiconductors 功能描述: |
| P89C58 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K Flash |
| P89C58BA | 制造商:未知厂家 制造商全称:未知厂家 功能描述:MICROCONTROLLER|8-BIT|8051 CPU|CMOS|LDCC|44PIN|PLASTIC |
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