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參數(shù)資料
| 型號： | P80C557E6 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Single-chip 8-bit microcontroller(單片8位微控制器) |
| 中文描述： | 單芯片8位微控制器（單片8位微控制器） |
| 文件頁數(shù)： | 44/64頁 |
| 文件大?。?/td> | 476K |
| 代理商： | P80C557E6 |
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Philips Semiconductors
Product specification
P83C557E6/P80C557E6
Single-chip 8-bit microcontroller
1999 Mar 02
44
6.13.4
This counter provides an overflow signal every second, when the
32kHz oscillator is running.
Seconds Timer
The overflow output sets the interrupt flag SECINT. This interrupt
can be disabled/enabled by ENSECI. If SECINT is enabled, it is
logically ORed with INT1 (external interrupt 1).
Seconds interrupt and INT1 therefor share the same priority and
vector. The software has to check both flags SECINT (PLLCON.5)
and IE1 (TCON.3), to distinguish between the two interrupt sources.
SECINT can only be cleared via writing a ‘0’ to this bit .
The external interrupts INT0 , INT1 or the seconds interrupt can
Wake–up the PLL oscillator and the microcontroller as described in
chapter “Wake–up from Power–down Mode”.
For a Wake–up via INT1 or seconds interrupt, IE1 must be enabled
and level–sensitive.
A further function of the seconds timer is to control the start–up
timing of the microcontroller after Reset or after Wake–up from
Power–down. It controls the stretching of the reset pulse to the
microcontroller and controls releasing the system clock to the
microcontroller.
A RSTIN signal of 1us at minimum will reset the microcontroller.
In case of Reset or Wake–up with halted 32kHz oscillator: From
RSTIN falling edge or Wake–up interrupt it takes 560ms at
maximum for the start–up of the 32kHz oscillator itself and the
stabilization of the PLL’s.
In case of Wake–up with running 32kHz oscillator: From Wake–up
interrupt it takes about 1ms for the stabilization of the PLL’s.
After this start–up time, the microcontroller is supplied with the
system clock and – in case of a reset – the internally
stretched reset
signal overlaps about 45us, to guarantee a proper initialization of the
microcontroller.
For further information refer to section 6.11 Power reduction modes.
XTAL3
Figure 45. Block diagram PLL
Oscil–
lator
32.768 KHz
C
1
32 kHz
Phase
comparator
Loop
filter
CCO
PD
Internal Bus
SECONDS TIMER
PLLCON
RSTIN
Programmable
divider
system clock
Reset to controller
’Seconds’
Interrupt
request
PD = power down
Stretched
Reset
RUN32 PD
R
f
C
2
XTAL4
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相關代理商/技術參數(shù) |
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| P80C557E6EBB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80C557E6EFB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller |
| P80C557E8 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8 BIT MICROCONTROLLER |
| P80C557E8EFB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| P80C562 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller |
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