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AT89C5131-RDTIL Datasheet(PDF) 22 Page - ATMEL Corporation |
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AT89C5131-RDTIL Datasheet(HTML) 22 Page - ATMEL Corporation |
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22 / 176 page  22 AT89C5131 4136B–USB–09/03 Registers Table 28. CKCON0 (S:8Fh) Clock Control Register 0 Reset Value = 0000 0000b 765 43210 - WDX2 PCAX2 SIX2 T2X2 T1X2 T0X2 X2 Bit Number Bit Mnemonic Description 7- Reserved The value read from this bit is always 0. Do not set this bit. 6WDX2 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. 5PCAX2 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. 4SIX2 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. 3T2X2 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. 2T1X2 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. 1T0X2 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. 0X2 System Clock Control bit Clear to select 12 clock periods per machine cycle (STD mode, FCPU = FPER = F OSC/2). Set to select 6 clock periods per machine cycle (X2 mode, F CPU = FPER = FOSC). |
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