Rainbow-electronics T89C51AC2 Manual de usuario descargar pdf (Pagina 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

0X2

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

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 109 110

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