89C51IC2-CM ATMEL [ATMEL Corporation], 89C51IC2-CM Datasheet - Page 24
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89C51IC2-CM
Manufacturer Part Number
89C51IC2-CM
Description
8-bit Flash Microcontroller with 2-wire Interface
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.89C51IC2-CM.pdf
(146 pages)
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24
AT89C51IC2
Table 20. 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
SPIX2
Bit
6
-
-
-
-
-
-
-
-
Description
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
-
1
-
4301A–8051–01/04
SPIX2
0
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