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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： | 24/24页 |
| 文件大小： | 142K |
| 代理商： | PCA84C122BT |
1995 May 01
9
Philips Semiconductors
Product specication
8-bit microcontrollers for
remote control transmitters
PCA84C122; 222; 422; 622; 822
8.1.1
ON-TIME REGISTER (ADDRESS: 00H)
This 8-bit register is loaded by software; the decimal value
of its contents + 2, determine the number of oscillator
cycles that the OUT pin is active.
The active period (ON-time) of OUT
8.1.2
OFF-TIME REGISTER (ADDRESS: 01H)
This 8-bit register is loaded by software; the decimal value
of its contents + 2, determine the number of oscillator
cycles that the OUT pin is inactive.
The inactive period (OFF-time) of OUT
contents
2
+
()
f
osc
---------------------------------------
=
contents
2
+
()
f
osc
---------------------------------------
=
8.1.3
PULSE COUNTER
The Pulse Counter, is a 10-bit register consisting of:
Pulse Counter Low (8-bit); address 02H.
Pulse Counter High (2-bit); address 04H.
The Pulse Counter is loaded by software with the number
of pulses required in a pulse burst; loading ‘0’ is not
allowed.
8.1.4
CONTROL REGISTER (ADDRESS 03H)
The Control Register contains the bits that control various
possibilities for the output pulses, plus the reset of the
interrupt flip-flop and the Watchdog timer.
Table 2
Control Register (CR)
Table 3
Description of the CR bits
8.2
Instructions for data transfer between the 84CXXX core and derivative logic
76543210
RWDT
Rint
PWM
LgP
HF
BIT
SYMBOL
DESCRIPTION
7to5
Reserved.
4
RWDT
Reload Watchdog Timer: This is not an actual ip-op in the Control Register. If a logic 1 is
written to this bit position the Watchdog Timer is reloaded (reset to 0); this bit is Write only.
3
Rint
Reset Interrupt: This is not an actual ip-op in the Control Register. If a logic 1 is written to this
bit position the interrupt ip-op is reset; this bit is Write only.
2
PWM
Pulse Width Modulation: Is the standard term for a quasi analog signal. It is a square wave
signal of which the duty cycle may be varied. When integrated a real analog signal may be
obtained. When PWM = 1; the Pulse Counter Register is ignored and a continuous pulse train is
generated (see Fig.9); this bit is Read or Write.
1
LgP
Long Pulse: When LgP = 1; the OFF-time Register is ignored and a single pulse of length
is generated. If HF = 1, this pulse is modulated with a
frequency 1
4 × fosc (see Fig.10); this bit is Read or Write.
0HF
High Frequency: When HF = 1 the ON-time part of the generated pulse is modulated with a
frequency 1
4 × fosc (see Fig.11); this bit is Read or Write.
INSTRUCTION
DESCRIPTION
MOV Dx,A
Move contents of the accumulator to the derivative register.
MOV A,Dx
Move contents of derivative register to the accumulator.
ANL Dx,A
AND derivative register contents with contents of accumulator. Result is stored in derivative register.
ORL Dx,A
OR derivative register contents with contents of accumulator. Result is stored in derivative register.
ON-time
()
number of pulses
()
×
=
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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 |
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