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| 型號(hào)： | UPD6134 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 4位單片機(jī)的紅外遙控傳輸 |
| 文件頁數(shù)： | 26/64頁 |
| 文件大?。?/td> | 410K |
| 代理商： | UPD6134 |
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26
μ
PD6133, 6134
Data Sheet U10454EJ6V0DS00
6. RESET PIN
The system reset takes effect by inputting low level to the RESET pin.
While the RESET pin is at low level, the system clock oscillator is stopped and the X
IN
and X
OUT
pins are fixed
to the GND.
If the RESET pin is raised from low level to high level, it executes the program from the 0 address after counting
60 to 116 of the system clock (f
X
).
Figure 6-1. Reset Operation by RESET Input
Wait
(60 to 116)/f
X
+
α
HALT mode
Oscillation
stopped
OPERATING mode or
STANDBY mode
RESET
0 address start
α
: Oscillation growth time
OPERATING
mode
The RESET pin outputs low level when the POC circuit (mask option) is in operation.
Caution When connecting a reset IC to the RESET pin, ensure that the IC is of the N-ch open drain output
type.
Table 6-1. Hardware Statuses After Reset
RESET Input in Operation
Resetting by Internal POC Circuit in Operation
Resetting by Other Factors
Note 1
RESET Input During STANDBY Mode
Resetting by the Internal POC Circuit During
STANDBY Mode
Hardware
PC (10 bits)
000H
SP (1 bit)
0B
Data
R0 = DP
000H
memory
R1-RF
Undefined
Previous status retained
Accumulator (A)
Undefined
Status flag (F)
0B
Carry flag (CY)
0B
Timer (10 bits)
000H
Port register
P0
FFH
P1
×
FH
Note 2
Control register P3
03H
P4
26H
Notes 1.
The following resets are available.
Reset when executing the HALT instruction (when the operand value is illegal or does not satisfy
the precondition)
Reset when executing the RLZ instruction (when A = 0)
Reset by stack pointer’s overflow or underflow
2.
Refers to the value by the K
I
pin status.
In order to prevent malfunction, be sure to input a low level to more than one of pins K
I0
to K
I3
when
reset is released (when RESET pin changes from low level to high level, or POC is released due to
supply voltage startup).
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