T89C51RD2 ATMEL Corporation, T89C51RD2 Datasheet - Page 12

• Manufacturer Part Number: T89C51RD2
• Description: 0 to 40MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

Reset Value = X000 0000b
Not bit addressable
Rev. F - 15 February, 2001
Number
Bit
1
0
Mnemonic
T0X2
Bit
X2
Timer0 clock (This control bit is validated when the CPU clock X2 is set; when X2 is low, this bit has no effect)
CPU clock
Set to select 6clock periods per machine cycle (X2 mode) and to enable the individual peripherals "X2" bits.
Clear to select 6 clock periods per peripheral clock cycle.
Clear to select 12 clock periods per machine cycle (STD mode) for CPU and all the peripherals.
Set to select 12 clock periods per peripheral clock cycle
Description
T89C51RD2
12