參數(shù)資料
型號: μPD78F9217Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 109/148頁
文件大小: 621K
代理商: ΜPD78F9217Y
Preliminary Product Information
109
μ
PD78F9217Y
10. RESET FUNCTIONS
The
μ
PD78F9217Y 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 10-1. 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
7
/f
CC
) elapses. A watchdog timer overflow-based reset sequence is terminated
7
/f
CC
).
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.
When a reset is used to deselect STOP mode, the information related to 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.
2.
Figure 10-1. Block Diagram of Reset Function
RESET
Count clock
Reset control circuit
Watchdog timer
Stop
Over-
flow
Reset signal
Interrupt function
相關(guān)PDF資料
PDF描述
μPD78F9418 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD78F9801 8 Bit Single Chip Microcontrollers
μPD78P0208 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD78P0308Y 8 Bit Single Chip Microcontrollers
μPD9210FGC-7EA USB Host Controller(USB主控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PD7935 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL COMMUNICATION
PD7937 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD793D26 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD793D7 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD79920-0M 制造商:Citizen Systems America Corporation 功能描述:Mobile Printer - PD24 USB Cable