ST10F276Z5 datasheet(15/239 Pages) STMICROELECTRONICS

15 / 239 page

ST10F276Z5

Description

15/239

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.

●

Embedded memory size has been significantly increased (both Flash and RAM).

●

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 conversion 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 potential limitations on maximum speed and maximum

capacitance load could be introduced (under evaluation): ST10F276Z5 will probably

not be able to address an external memory at 64 MHz with 0 wait states (under

evaluation).

●

XPERCON register bit mapping modified according to new peripherals implementation

(not fully compatible with ST10F269).

●

Bond-out chip for emulation (ST10R201) cannot achieve more than 50 MHz 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 500 mV of hysteresis) and standard CMOS (with up to 800 mV of hysteresis).

●

Output transition is not programmable.

●

CAN module is enhanced: the ST10F276Z5 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-

25 MHz down to 4-12 MHz. This is a high performance oscillator amplifier, providing a

very high negative resistance and wide oscillation amplitude: when this on-chip

amplifier is used as reference for real-time clock module, the power-down consumption

is dominated by the consumption of the oscillator amplifier itself. A metal option is

added to offer a low power oscillator amplifier working in the range of 4-8 MHz: this will

allow a power consumption reduction when real-time clock is running in Power-down

mode using as reference the on-chip main oscillator clock.

●

A second on-chip oscillator amplifier circuit (32 kHz) is implemented for low power

modes: it can be used to provide the reference to the real-time clock counter (either in

Power-down or Standby mode). Pin XTAL3 and XTAL4 replace a couple of VDD/VSS

pins of ST10F269.

●

Possibility to re-program internal XBUS chip select window characteristics (XRAM2 and

XFLASH address window) is added.

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