參數(shù)資料
型號: μPD789417
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 93/126頁
文件大小: 590K
代理商: ΜPD789417
93
μ
PD789415, 789416, 789417
8. RESET FUNCTIONS
The
μ
PD789415,
μ
PD789416, and
μ
PD789417 can be reset using the following signals.
(1) External reset signal input to the RESET pin
(2) Internal reset signal generated upon the elapse of the period set in the watchdog timer, used for detecting an
unintended program loop
The external and internal reset signals are functionally equivalent. When RESET is input, they cause program
execution to begin at the addresses indicated at addresses 0000H and 0001H, respectively.
If a low level signal is applied to the RESET pin, or if the watchdog timer overflows, a reset occurs, causing each
piece of the hardware to enter the states listed in Table 8-1. While a reset signal is being input, or while the
oscillation frequency is settling immediately after the end of a reset sequence, each pin remains in the high-
impedance state.
If a high level signal is applied to the RESET pin, a reset sequence is terminated, and program execution begins
once the oscillation settling time (2
automatically. Similarly, program execution begins upon the elapse of the oscillation settling time (2
15
/f
x
) elapses. A watchdog timer overflow-based reset sequence is terminated
15
/f
x
).
Cautions 1. To use an external reset sequence, supply a low level signal to the RESET pin and
maintain the signal for at least 10
μ
s.
2.
When a reset is used to deselect STOP mode, the information related to the STOP mode
is held during the reset sequence, that is, while the reset signal is applied. The port
pins remain in the high-impedance state, however.
Figure 8-1. Reset Function Block Diagram
RESET
Count clock
Reset control circuit
Watchdog timer
Stop
Over-
flow
Reset signal
Interrupt function
相關(guān)PDF資料
PDF描述
μPD789415 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD789416 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD789800 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD789830 8 Bit Single Chip Microcontrollers(8 位微控制器)
μPD78F9831 8 Bit Single Chip Microcontrollers(8 位微控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD78F0134 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134(A) 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134(A1) 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134A 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers
PD78F0134A1 制造商:NEC 制造商全稱:NEC 功能描述:8-Bit Single-Chip Microcontrollers