ST10F280_12 datasheet(196/239 Pages) STMICROELECTRONICS

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Special function register overview

ST10F280

196/239

Doc ID 8673 Rev. 3

19.2

System configuration registers

The ST10F280 has registers used for different configuration of the overall system. These

registers are described below.

SYSCON

Address:

0xFF12h / 89h SFR

Reset:

0x0XX0h

Type:

R/W

Note:

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

XPER-SHARE XBUS Peripheral Share Mode Control

0: External accesses to XBUS peripherals are disabled

1: XBUS peripherals are accessible via the external bus during hold mode

VISIBLE Visible Mode Control

0: Accesses to XBUS peripherals are done internally

1: XBUS peripheral accesses are made visible on the external pins

XPEN XBUS Peripheral Enable bit

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

1: The on-chip X-Peripherals are enabled.

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. Exit power down only with reset.

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 or with external reset.

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