參數(shù)資料
型號(hào)： P80C557E4EBB
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Single-chip 8-bit microcontroller
中文描述： 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80
封裝： 14 X 20 MM, 2.70 MM HEIGHT, PLASTIC, SOT-318-1, QFP-80
文件頁數(shù)： 24/72頁
文件大?。?/td> 374K
代理商： P80C557E4EBB
Philips Semiconductors
Product specification
P83C557E4/P80C557E4/P89C557E4
Single-chip 8-bit microcontroller
1999 Mar 02
24
6.7.2
Timer T2 is a 16 bit timer/counter which has capture and compare
facilities. The operational diagram is shown in Figure 21.
Timer T2
The 16 bit timer/counter is clocked via a prescaler with a
programmable division factor of 1, 2, 4 or 8. The input of the
prescaler is clocked with 1/12 of the clock frequency, or by an
external source connected to the T2 input, or it is switched off. The
maximum repetition rate of the external clock source is f
CLK
/12,
twice that of Timer 0 and Timer 1. The prescaler is incremented on a
rising edge. It is cleared if its division factor or its input source is
changed, or if the timer/counter is reset (see also Figure 22:
TM2CON). T2 is readable ’on the fly’, without any extra read
latches; this means that software precautions have to be taken
against misinterpretation at overflow from least to most significant
byte while T2 is being read. T2 is not loadable and is reset by the
RST signal or at the positive edge of the input signal RT2, if
enabled. In the Idle or Power-down Mode the timer/counter and
prescaler are reset and halted.
T2 is connected to four 16-bit Capture Registers: CT0, CT1, CT2
and CT3. A rising or falling edge on the inputs CT0I, CT1I, CT2I or
CT3I (alternative function of Port 1) results in loading the contents of
T2 into the respective Capture Registers and an interrupt request.
Using the Capture Register CTCON (see Figure 23), these inputs
may invoke capture and interrupt request on a positive, a negative
edge or on both edges. If neither a positive nor a negative edge is
selected for capture input, no capture or interrupt request can be
generated by this input.
INT
INT
Figure 21. Block diagram of Timer 2.
CT0
CT1
CT2
CT3
CTI0
INT
CT0I
CTI1
CT1I
CTI2
CT2I
CTI3
CT3I
1/12
Prescaler
T2 Counter
8-bit overflow interrupt
16-bit overflow interrupt
External reset
enable
off
f
CLK
T2
RT2
T2ER
COMP
CMO (S)
INT
COMP
CM1 (R)
INT
COMP
CM2 (T)
INT
P4.0
P4.1
P4.2
P4.3
P4.4
P4.5
P4.6
P4.7
R
R
R
R
R
R
T
T
S
S
S
S
S
S
TG
TG
STE
RTE
I/O port 4
S
= set
R
= reset
T
= toggle
TG = toggle status
T2 SFR address: TML2 = lower 8 bits
TMH2 = higher 8 bits
INT
相關(guān)PDF資料
PDF描述
P80C557E8 8 BIT MICROCONTROLLER
P83C557E8 8 BIT MICROCONTROLLER
P83C557E4EBB Single-chip 8-bit microcontroller
P83C557E4EFB Single-chip 8-bit microcontroller
P89C557E4EBB Single-chip 8-bit microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P80C557E4EFB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller
P80C557E4EFB/01,51 功能描述:8位微控制器 -MCU SINGLE-CHIP 8-BIT MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
P80C557E4EFB/01,518 制造商:NXP Semiconductors 功能描述:
P80C557E4EFB/01,55 功能描述:8位微控制器 -MCU RMLS/1K RAM I2C ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
P80C557E4EFB/01,557 制造商:NXP Semiconductors 功能描述:
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