AT89C51ID2-SMSIM ATMEL [ATMEL Corporation], AT89C51ID2-SMSIM Datasheet - Page 25

• Manufacturer Part Number: AT89C51ID2-SMSIM
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

4289A–8051–09/03
Table 21. CKCON1 Register
CKCON1 - Clock Control Register (AFh)
Reset Value = XXXX XXX0b
Not bit addressable
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic Description
SPIX2
Bit
6
-
-
-
-
-
-
-
-
Reserved
Reserved
Reserved
Reserved
Reserved
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.
5
-
4
-
3
-
2
-
AT89C51ID2
1
-
SPIX2
0
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