Rainbow-electronics AT89C51SND1C Manuel d'utilisateur télécharger pdf (Page 157)

157

AT8xC51SND1C

4109E–8051–06/03

Table 133. SPSTA Register

SPSTA (S:C4h) – SPI Status Register

Reset Value = 00000 0000b

Table 134. SPDAT Register

SPDAT (S:C5h) – Synchronous Serial Data Register

Reset Value = XXXX XXXXb

76543210

SPIFWCOL-MODF----

Bit

Number

Bit

Mnemonic Description

7SPIF

SPI Interrupt Flag

Set by hardware when an 8-bit shift is completed.

Cleared by hardware when reading or writing SPDAT after reading SPSTA.

6WCOL

Write Collision Flag

Set by hardware to indicate that a collision has been detected.

Cleared by hardware to indicate that no collision has been detected.

Reserved

The value read from this bit is indeterminate. Do not set this bit.

4MODF

Mode Fault

Set by hardware to indicate that the SS

pin is at an appropriate level.

Cleared by hardware to indicate that the SS

pin is at an inappropriate level.

3 - 0 -

Reserved

The value read from these bits is indeterminate. Do not set these bits.

76543210

SPD7SPD6SPD5SPD4SPD3SPD2SPD1SPD0

Bit

Number

Bit

Mnemonic Description

7 - 0 SPD7:0 Synchronous Serial Data.

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 209 210

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Rainbow-electronics AT89C51SND1C Manuel d'utilisateur Page 157