Отправлено MALLOY 02 ноября 2004 г. 16:53 В ответ на: Ответ: Третье состояние отправлено Игорь(Казань) 02 ноября 2004 г. 16:35

DESCRIPTION
The flash boot loader code is executed every time the part is powered on or reset. The loader can execute the ISP command
handler or the user application code. A LOW level after reset at the P0.14 pin is considered as the external hardware request to
start the ISP command handler. This pin is sampled in software. Asuming that proper signal is present on X1 pin when the rising
edge on RST pin is generated, it may take up to 3 ms before P0.14 is sampled and the decision on wether to continue with user
code or ISP handler is made. If P0.14 is sampled low and the watchdog overflow flag is set, the external hardware request to
start the ISP command handler is ignored. If there is no request for the ISP command handler execution (P0.14 is sampled HIGH
after reset), a search is made for a valid user program. If a valid user program is found then the execution control is transferred
to it. If a valid user program is not found, the auto-baud routine is invoked.
Pin P0.14 that is used as hardware request for ISP requires special attention. Since P0.14 is in high impedance mode after reset,
it is important that the user provides external hardware (a pull-up resistor or other device) to put the pin in a defined state.
Otherwise unintended entry into ISP mode may occur.

• Запаяли 1, помогло, запускается — Игорь(Казань)   (02.11.2004 17:22, пустое)