at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 20

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

20
AT89C51RD2/ED2
Reset Value = XXXX XXX0b
Not bit addressable
Number
Bit
2
1
0
Mnemonic
SPIX2
Bit
-
-
Description
Reserved
Reserved
SPI (This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit
has no effect).
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
4235J–8051–01/08