- 您現在的位置：買賣IC網 > PDF目錄382369 > P87LPC762 (NXP Semiconductors N.V.) Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP PDF資料下載
參數資料
| 型號： | P87LPC762 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
| 中文描述： | 低功耗，低價格，低管腳數的2字節檢察官辦公室20引腳微控制器 |
| 文件頁數： | 31/57頁 |
| 文件大小： | 312K |
| 代理商： | P87LPC762 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁當前第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁
Philips Semiconductors
Preliminary data
87LPC762
Low power, low price, low pin count (20 pin)
microcontroller with 2 kbyte OTP
2001 Oct 26
28
Timer/Counters
The 87LPC762 has two general purpose counter/timers which are
upward compatible with the standard 80C51 Timer 0 and Timer 1.
Both can be configured to operate either as timers or event counters
(see Figure 22). An option to automatically toggle the T0 and/or T1
pins upon timer overflow has been added.
In the “Timer” function, the register is incremented every machine
cycle. Thus, one can think of it as counting machine cycles. Since a
machine cycle consists of 6 CPU clock periods, the count rate is 1/6
of the CPU clock frequency. Refer to the section Enhanced CPU for
a description of the CPU clock.
In the “Counter” function, the register is incremented in response to
a 1-to-0 transition at its corresponding external input pin, T0 or T1.
In this function, the external input is sampled once during every
machine cycle. When the samples of the pin state show a high in
one cycle and a low in the next cycle, the count is incremented. The
new count value appears in the register during the cycle following
the one in which the transition was detected. Since it takes 2
machine cycles (12 CPU clocks) to recognize a 1-to-0 transition, the
maximum count rate is 1/6 of the CPU clock frequency. There are no
restrictions on the duty cycle of the external input signal, but to
ensure that a given level is sampled at least once before it changes,
it should be held for at least one full machine cycle.
The “Timer” or “Counter” function is selected by control bits C/T in
the Special Function Register TMOD. In addition to the “Timer” or
“Counter” selection, Timer 0 and Timer 1 have four operating
modes, which are selected by bit-pairs (M1, M0) in TMOD. Modes 0,
1, and 2 are the same for both Timers/Counters. Mode 3 is different.
The four operating modes are described in the following text.
BIT
TMOD.7
SYMBOL
GATE
FUNCTION
Gating control for Timer 1. When set, Timer/Counter is enabled only while the INT1 pin is high and
the TR1 control pin is set. When cleared, Timer 1 is enabled when the TR1 control bit is set.
Timer or Counter Selector for Timer 1. Cleared for Timer operation (input from internal system clock.)
Set for Counter operation (input from T1 input pin).
Mode Select for Timer 1 (see table below).
Gating control for Timer 0. When set, Timer/Counter is enabled only while the INT0 pin is high and
the TR0 control pin is set. When cleared, Timer 0 is enabled when the TR0 control bit is set.
Timer or Counter Selector for Timer 0. Cleared for Timer operation (input from internal system clock.)
Set for Counter operation (input from T0 input pin).
Mode Select for Timer 0 (see table below).
Timer Mode
8048 Timer “TLn” serves as 5-bit prescaler.
16-bit Timer/Counter “THn” and “TLn” are cascaded; there is no prescaler.
8-bit auto-reload Timer/Counter. THn holds a value which is loaded into TLn when it overflows.
Timer 0 is a dual 8-bit Timer/Counter in this mode. TL0 is an 8-bit Timer/Counter controlled by the
standard Timer 0 control bits. TH0 is an 8-bit timer only, controlled by the Timer 1 control bits (see
text). Timer 1 in this mode is stopped.
TMOD.6
C/T
TMOD.5, 4
TMOD.3
M1, M0
GATE
TMOD.2
C/T
TMOD.1, 0
M1, M0
M1, M0
0 0
0 1
1 0
1 1
M0
SU01171
M1
C/T
GATE
M0
M1
C/T
GATE
0
1
2
3
4
5
6
7
TMOD
Reset Value: 00h
Not Bit Addressable
Address: 89h
T1
T0
Figure 22. Timer/Counter Mode Control Register (TMOD)
相關PDF資料 |
PDF描述 |
|---|---|
| P87LPC768 | Low Power, Low System Cost 80C51 MCU with ADC and PWM |
| P87LPC768BN | Low Power, Low System Cost 80C51 MCU with ADC and PWM |
| P88-3004 | TONER VACUUM STD 220/240V |
| P88-3005 | TONER FILTER STD 0.3 MICRON |
| P88-3010 | TONER VACUUM XPRS 220/240V |
相關代理商/技術參數 |
參數描述 |
|---|---|
| P87LPC762BD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
| P87LPC762BD,512 | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| P87LPC762BD512 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 20MHZ SOIC-20 |
| P87LPC762BDH | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
| P87LPC762BDH,512 | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT |
發布緊急采購，3分鐘左右您將得到回復。