Rainbow Electronics T89C51AC2 - Manual (Page 18)

18
T89C51AC2
Rev. B – 19-Dec-01
Notes: 1. This control bit is validated when the CPU clock bit X2 is set; when X2 is low, this bit
has no effect.
Reset Value = 0000 0000b
0 X2
CPU clock
Clear to select 12 clock periods per machine cycle (STD mode) for CPU and all
the peripherals.
Set to select 6 clock periods per machine cycle (X2 mode) and to enable the
individual peripherals "X2"bits.
Bit
Number
Bit
Mnemonic Description