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AT89C5131A-RDTIL Datasheet(PDF) 16 Page - ATMEL Corporation |
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AT89C5131A-RDTIL Datasheet(HTML) 16 Page - ATMEL Corporation |
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16 / 184 page  16 AT89C5131A-L 4338F–USB–08/07 Registers Table 14. CKCON0 (S:8Fh) Clock Control Register 0 Reset Value = 0000 0000b 7 6 5 4 3 2 1 0 TWIX2 WDX2 PCAX2 SIX2 T2X2 T1X2 T0X2 X2 Bit Number Bit Mnemonic Description 7 TWIX2 TWI Clock 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. 6 WDX2 Watchdog Clock 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 PCAX2 Programmable Counter Array Clock 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. 4 SIX2 Enhanced UART Clock (Mode 0 and 2) 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. 3 T2X2 Timer2 Clock 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. 2 T1X2 Timer1 Clock 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. 1 T0X2 Timer0 Clock 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. 0 X2 System Clock Control bit Clear to select 12 clock periods per machine cycle (STD mode, F CPU = FPER = FOSC/2). Set to select 6 clock periods per machine cycle (X2 mode, F CPU = FPER = FOSC). |
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