at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 19

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

4383D–8051–02/08
Table 3. CKCON1 Register
CKCON1 (S:9Fh)
Clock Control Register 1
Note:
Reset Value = XXXX XXX0b
Number
Bit
7-1
7
0
1. This control bit is validated when the CPU clock bit X2 is set; when X2 is low, this bit
has no effect.
Mnemonic Description
SPIX2
Bit
6
-
Reserved
The value read from these bits is indeterminate. Do not set these bits.
SPI clock
Clear to select 6 clock periods per peripheral clock cycle.
Set to select 12 clock periods per peripheral clock cycle.
5
(1)
4
3
2
1
SPIX2
0
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