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| 型号： | PCA84C122BT |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-bit microcontrollers for remote control transmitters |
| 中文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | 7.50 MM, PLASTIC, SOT-163-1, SO-20 |
| 文件页数： | 23/24页 |
| 文件大小： | 142K |
| 代理商： | PCA84C122BT |
1995 May 01
8
Philips Semiconductors
Product specication
8-bit microcontrollers for
remote control transmitters
PCA84C122; 222; 422; 622; 822
8
HARDWARE MODULATOR
The Hardware Modulator is the main derivative part in the
PCA84C122. Figure 7 shows the internal architecture.
The Hardware Modulator generates a pulse train whereby
the ON-time of a pulse and the OFF-time between pulses
can be programmed in a number of clock cycles
(period = 1/fosc); see Figs 8 and 7.
The number of pulses of the train is also programmable.
The time between pulse bursts is determined by software,
possibly using the standard 8-bit Timer/Counter.
8.1
Interface between the 84CXXX core and
derivative logic
There are three (derivative) registers and one (derivative)
counter that must be loaded from the core.
Fig.7 Hardware Modulator.
MCD255 - 1
internal bus (IB0 – 7)
CONTROL LOGIC
control
PULSE COUNTER
HIGH
(2)
PULSE TIMER
PULSE COUNTER
LOW
(8)
OFF-TIME
REGISTER
(8)
ON-TIME
REGISTER
(8)
CONTROL
REGISTER
(5)
f osc
OUT
(8)
Fig.8 Example pulse train output of OUT pin.
OFF-time
ON-time
pulse #1
pulse #2
pulse #3
interrupt
end
elapse time by software
OFF-time = 4 (off-time register = 2)
ON-time = 2 (on-time register = 0)
number of pulses = 3
start
MCD254
OUT
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相关代理商/技术参数 |
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|---|---|
| PCA84C222 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C222A | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C222AP | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C222AT | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
| PCA84C222B | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit microcontrollers for remote control transmitters |
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