st10f272z2 STMicroelectronics, st10f272z2 Datasheet - Page 135

• Manufacturer Part Number: st10f272z2
• Description: 16-bit Mcu With 256 Kbyte Flash Memory And 20 Kbyte Ram
• Manufacturer: STMicroelectronics

ST10F272Z2
24.7
24.8
multiplexed bus with memory tristate wait state is used, the PWRDN instruction must be
executed from internal RAM or XRAM.
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 greater 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.
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
Known limitations
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