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AT80C51RB2-SLSIM Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT80C51RB2-SLSIM Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 83 page  12 AT80C51RD2/AT83C51Rx2 4113B–8051–03/05 Table 5. CKCON0 Register CKCON0 - Clock Control Register (8Fh) Reset Value = 0000 000’HCB.X2’b (see Hardware Config Byte) Not bit addressable 7654 3210 - WDX2 PCAX2 SIX2 T2X2 T1X2 T0X2 X2 Bit Number Bit Mnemonic Description 7- Reserved 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). Cleared 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). Cleared 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). Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock periods per peripheral clock cycle. 3T2X2 Timer 2 clock (This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no effect). Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock periods per peripheral clock cycle. 2T1X2 Timer 1 clock (This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no effect). Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock periods per peripheral clock cycle 1T0X2 Timer 0 clock (This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no effect). Cleared to select 6 clock periods per peripheral clock cycle. Set to select 12 clock periods per peripheral clock cycle 0X2 CPU clock Cleared to select 12 clock periods per machine cycle (STD mode) for CPU and all the peripherals. Set to select 6clock periods per machine cycle (X2 mode) and to enable the individual peripherals "X2" bits. Programmed by hardware after Power-up regarding Hardware Config Byte (HCB). |
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