ST10F272B_12 STMICROELECTRONICS [STMicroelectronics], ST10F272B_12 Datasheet - Page 12

• Manufacturer Part Number: ST10F272B_12
• Description: 16-bit MCU with 256 Kbyte Flash memory and 12/20 Kbyte RAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Introduction
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for the RAM, the low-voltage section of the 32kHz oscillator and the Real Time Clock
module when not disabled. It is allowed to exceed the upper limit up to 6V for a very short
period of time during the global life of the device, and exceed the lower limit down to 4V
when RTC and 32kHz on-chip oscillator are not used.
A second SSC mapped on the XBUS is added (SSC of ST10F269 becomes here SSC0,
while the new one is referred as XSSC or simply SSC1). Note that some restrictions and
functional differences due to the XBUS peculiarities are present between the classic SSC,
and the new XSSC.
A second ASC mapped on the XBUS is added (ASC0 of ST10F269 remains ASC0, while
the new one is referred as XASC or simply as ASC1). Note that some restrictions and
functional differences due to the XBUS peculiarities are present between the classic ASC,
and the new XASC.
A second PWM mapped on the XBUS is added (PWM of ST10F269 becomes here PWM0,
while the new one is referred as XPWM or simply as PWM1). Note that some restrictions
and functional differences due to the XBUS peculiarities are present between the classic
PWM, and the new XPWM.
An I2C interface on the XBUS is added (see X-I2C or simply I2C interface).
CLKOUT function can output either the CPU clock (like in ST10F269) or a software
programmable prescaled value of the CPU clock.
On-chip RAM memory has been increased (Flash size remained the same).
PLL multiplication factors have been adapted to new frequency range.
A/D Converter is not fully compatible versus ST10F269 (timing and programming model).
Formula for the convertion time is still valid, while the sampling phase programming model is
different.
Besides, additional 8 channels are available on P1L pins as alternate function: the accuracy
reachable with these extra channels is reduced with respect to the standard Port5 channels.
External Memory bus is affected by limitations on maximum speed and maximum
capacitance load: ST10F272 is not able to address an external memory at 64MHz with 0
wait states.
XPERCON register bit mapping modified according to new peripherals implementation (not
fully compatible with ST10F269).
Bondout chip for emulation (ST10R201) cannot achieve more than 50MHz at room
temperature (so no real time emulation possible at maximum speed).
Input section characteristics are different. The threshold programmability is extended to all
port pins (additional XPICON register); it is possible to select standard TTL (with up to
400mV of hysteresis) and standard CMOS (with up to 750mV of hysteresis).
Output transition is not programmable.
CAN module is enhanced: ST10F272 implements two C-CAN modules, so the programming
model is slightly different. Besides, the possibility to map in parallel the two CAN modules is
added (on P4.5/P4.6).
On-chip main oscillator input frequency range has been reshaped, reducing it from 1-25MHz
down to 4-8MHz. This is a low power oscillator amplifier, that allows a power consumption
reduction when Real Time Clock is running in Power Down mode, using as reference the on-
chip main oscillator clock. When this on-chip amplifier is used as reference for Real Time
Doc ID 11917 Rev 3
ST10F272B/ST10F272E