ST10F272M datasheet(83/175 Pages) STMICROELECTRONICS

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ST10F272M

System reset

83/176

Figure 20.

Asynchronous hardware RESET (EA = 0)

Longer than Port0 settling time + PLL synchronization (if needed, that is P0(15:13) changed).

Longer than 500ns to take into account of Input Filter on RSTIN pin.

3 to 8 TCL depending on clock source selection.

Exit from asynchronous reset state

When the RSTIN pin is pulled high, the device restarts: As already mentioned, if internal

Flash is used, the restarting occurs after the embedded Flash initialization routine is

completed. The system configuration is latched from Port0: ALE, RD and WR/WRL pins are

driven to their inactive level. The ST10F272M starts program execution from memory

location 00'0000h in code segment 0. This starting location will typically point to the general

initialization routine. The timings of asynchronous Hardware Reset sequence are

summarized in Figure 19 and Figure 20.

20.3

Synchronous reset (warm reset)

A synchronous reset is triggered when RSTIN pin is pulled low while RPD pin is at high

level. In order to properly activate the internal reset logic of the device, the RSTIN pin must

be held low, at least, during 4 TCL (two periods of CPU clock): refer also to Section 20.1 for

details on minimum reset pulse duration. The I/O pins are set to high impedance and

RSTOUT pin is driven low. After RSTIN level is detected, a short duration of a maximum of

12 TCL (six periods of CPU clock) elapses, during which pending internal hold states are

cancelled and the current internal access cycle if any is completed. External bus cycle is

aborted. The internal pull-down of RSTIN pin is activated if bit BDRSTEN of SYSCON

RSTF

P0[15:13]

P0[12:2]

transparent

not t.

transparent

not t.

P0[1:0]

not t.

not transparent

3..8 TCL(2)

RST

Latching point of Port0 for

system start-up configuration

RPD

ALE

(1)

not transparent

(After Filter)

RSTIN

≤ 500ns

≥ 50ns

≤ 500ns

≥ 50ns

8 TCL

3..4 TCL

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