ST10F271Z1 datasheet(131/185 Pages) STMICROELECTRONICS

131 / 185 page

ST10F271Z1

Known limitations

131/185

multiplexed bus with memory tristate wait state is used, the PWRDN instruction must be

executed from internal RAM or XRAM.

24.7

Flash wake-up from power-down mode

Description

When waking up from interruptible power-down mode, the Flash response time is slower

than in running mode. This can lead to an incorrect data read or code fetch when the CPU

frequency is higher than 55 MHz.

As a consequence, exiting from interruptible power-down mode with an external interrupt is

not supported for frequencies greater than 55 MHz.

Workaround

There is no workaround for frequencies greater than 55 MHz.

Exiting from interruptible power-down mode with an external reset is supported at all

frequencies.

24.8

Behavior of CAPCOM outputs in compare mode 3

Description

When a CAPCOM channel is configured in compare mode 3, then the related output level

switches to high when the allocated timer, Tx, matches the related CAPCOM register, CCy.

When an overflow occurs on the CAPCOM timer Tx, it is reloaded with TxREL content and

the output pin is cleared. The output pin level does not change if TxREL and CCy have the

same value.

The related CAPCOM output stays low when the CAPCOM channel is configured in

compare mode 3 and TxREL and Tx related timer registers are loaded with the same value

as CCy. This is obtained by executing the following instructions:

MOV TxREL, #CCy value x =0,1,7,8

MOV Tx, #CCy value x = 0,1,7,8

MOV TxxCON, #data or bfldl/bfldh TxxCON , #mask, #data i.e. an

access is made to the T01CON or T78CON register.

Workarounds

The following workarounds make the CAPCOM output toggle as expected:

1) Invert the TxREL and Tx configuration as follow:

MOV Tx, #CCy value

MOV TxREL, #CCy value

bfldl/bfldh TxxCON , #mask, #data or MOV TxxCON, #data

2) Insert a NOP instruction before the T01CON or T78CON configuration:

MOV Tx, #value

MOV TxREL, #value

NOP

bfldl/bfldh TxxCON , #mask, #data or MOV TxxCON, #data

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