ST10F280_12 datasheet(197/239 Pages) STMICROELECTRONICS

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ST10F280

Special function register overview

Doc ID 8673 Rev. 3

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CSCFG Chip Select Configuration Control

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

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

WRCFG Write Configuration Control (Inverted copy of bit WRC of RP0H)

0: Pins WR and BHE retain their normal function

1: Pin WR acts as WRL, pin BHE acts as WRH.

CLKEN System Clock Output Enable (CLKOUT)

0: CLKOUT disabled: pin may be used for general purpose I/O

1: CLKOUT enabled: pin outputs the system clock signal.

BYTDIS Disable/Enable Control for Pin BHE (Set according to data bus width)

0: Pin BHE enabled

1: Pin BHE disabled, pin may be used for general purpose I/O.

ROMEN Internal Memory Enable (Set according to pin EA during reset)

0: Internal Memory disabled: accesses to the Memory area use the external bus

1: Internal Memory enabled.

SGTDIS Segmentation Disable/Enable Control

0: Segmentation enabled (CSP is saved/restored during interrupt entry/exit)

1: Segmentation disabled (Only IP is saved/restored).

ROMS1 Internal Flash Memory Mapping

0: Internal Flash Memory area mapped to segment 0 (00’0000H...00’7FFFH)

1: Internal Flash Memory area mapped to segment 1 (01’0000H...01’7FFFH).

STKSZ System Stack Size

Selects the size of the system stack (in the internal RAM) from 32 to 1024 words.

Table 40.

Stack size selection

<STKSZ>

Stack

size

(words)

Internal RAM addresses (words) of physical stack

Significant bits

of stack pointer

0 0 0 b

256

00’FBFEh...00’FA00h (Default after Reset)

SP.8...SP.0

0 0 1 b

128

00’FBFEh...00’FB00h

SP.7...SP.0

0 1 0 b

00’FBFEh...00’FB80h

SP.6...SP.0

0 1 1 b

00’FBFEh...00’FBC0h

SP.5...SP.0

1 0 0 b

512

00’FBFEh...00’F800h (not for 1K Byte IRAM)

SP.9...SP.0

1 0 1 b

Reserved. Do not use this combination

1 1 0 b

Reserved. Do not use this combination

1 1 1 b

1024

00’FDFEh...00’FX00h (Note: No circular stack)

00’FX00h represents the lower IRAM limit, i.e.

1K Byte: 00’FA00h, 2K Byte: 00’F600h, 3K Byte:

00’F200h

SP.11...SP.0

ST10F280 Datasheet(PDF) 197 Page - STMicroelectronics

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