參數(shù)資料
型號(hào)： UPD17215
廠商： NEC Corp.
元件分類： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁數(shù)： 51/84頁
文件大?。?/td> 350K
代理商： UPD17215
μ
PD17215, 17216, 17217, 17218
51
9.3
Reset by Stack Pointer (Connect RESET and WDOUT pins)
When the value of the stack pointer reaches 6H or 7H during program execution, a low level is output to the WDOUT
pin, and the program counter is reset to 0.
If the nesting level of the interrupt or subroutine call exceeds 5 (stack over flow), or if the return instruction is executed
without correspondence between CALL and return (RET) instructions established, then regardless of a stack level of 0 (stack
underflow), the program can be restarted from address 0H.
Table 9-1 Status of Each Hardware After Reset
Hardware
RESET Input During
Standby Mode
RESET Input
During Operation
Program Counter (PC)
0000H
0000H
Port
Input/output
Input
Input
Output latch
0
0
Data Memory (RAM)
General-purpose data memory
(Except DBF, port register)
Retains previous
status
Undefined
DBF
0320H
0320H
System register (SYSREG)
0
0
WR
Retains previous
status
Undefined
Control Register
Refer to
Fig. 11-1 Register Files
8-bit Timer
Counter (TMC)
00H
00H
Modulo register (TMM)
FFH
FFH
Remote Controller Carrier
Generator
NRZ high level period setting modulo register
(NRZHTMM)
Retains previous
status
Undefined
NRZ low level period setting modulo register
(NRZLTMM)
Basic Interval Timer/Watchdog Timer Counter
00H
00H
10. LOW-VOLTAGE DETECTOR CIRCUIT (CONNECT RESET AND WDOUT PINS)
The low-voltage detector circuit outputs a low level from the WDOUT pin for initialization (reset) to prevent program hang-
up that may take place when the batteries are replaced, if the circuit detects a low voltage.
A drop in the supply voltage is detected if the status of T
A
= -10 to +85
°
C, V
DD
= 0.8 to 2.2 V lasts for 1 ms or longer.
Note, however, that 1 ms is the guaranteed value and that the microcontroller may be reset even if the above low-voltage
condition lasts for less than 1 ms.
Although the voltage at which the the reset function is effected ranges from 0.8 to 2.2 V, the program counter is prevented
from hang-up even if the supply voltage drops until the reset function is effected, if the instruction execution time is from 8
to 32
μ
s. Note that some oscillators stop oscillating before the reset function is effected.
The low-voltage detector circuit can be set arbitrarily by the mask option.
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