ST10F280_12 datasheet(53/239 Pages) STMICROELECTRONICS

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ST10F280

Central Processing Unit (CPU)

Doc ID 8673 Rev. 3

53/239

The system configuration register SYSCON

This bit-addressable register provides general system configuration and control functions.

The reset value for register SYSCON depends on the state of the PORT0 pins during reset.

SYSCON

Address:

0xFF12h / 89h SFR

Reset:

0x0XX0h

Type:

R/W

STKSZ

XPEN

R/W

R/W(1)

These bit are set directly or indirectly according to PORT0 and EA pin configuration during reset sequence.

R/W(1)

R/W

R/W(1)

R/W

XPEN XBUS Peripheral Enable Bit

0: Accesses to the on-chip X-Peripherals and their functions are disabled

1: The on-chip X-Peripherals are enabled and can be accessed.

BDRSTEN Bidirectional Reset Enable

0: RSTIN pin is an input pin only. SW Reset or WDT Reset have no effect on this pin

1: RSTIN pin is a bidirectional pin. This pin is pulled low during 1024 TCL during reset

sequence.

OWDDIS Oscillator Watchdog Disable Control

0: Oscillator Watchdog (OWD) is enabled. If PLL is bypassed, the OWD monitors

XTAL1 activity. If there is no activity on XTAL1 for at least 1

μs, the CPU clock is

switched automatically to PLL’s base frequency (2 to 10MHz).

1: OWD is disabled. If the PLL is bypassed, the CPU clock is always driven by XTAL1

signal. The PLL is turned off to reduce power supply current.

PWDCFG Power Down Mode Configuration Control

0: Power Down Mode can only be entered during PWRDN instruction execution if NMI

pin is low, otherwise the instruction has no effect. To exit Power Down Mode, an

external reset must occurs by asserting the RSTIN pin.

1: Power Down Mode can only be entered during PWRDN instruction execution if all

enabled fast external interrupt EXxIN pins are in their inactive level. Exiting this mode

can be done by asserting one enabled EXxIN pin.

CSCFG Chip Select Configuration Control

0: Latched Chip Select lines: CSx change 1 TCL after rising edge of ALE

1: Unlatched Chip Slect lines: CSx change with rising edge of ALE

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