T89C51RD2-3CSCM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

T89C51RD2-3CSCM

0 to 40MHz Flash Programmable 8-bit Microcontroller

Atmel Corporation 

Bit

Bit

Number Mnemonic Description

Timer1 clock (This control bit is validated when the CPU clock X2 is set; when X2

is low, this bit has no effect)

2

T1X2 Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle

Timer0 clock (This control bit is validated when the CPU clock X2 is set; when X2

is low, this bit has no effect)

1

T0X2 Clear to select 6 clock periods per peripheral clock cycle.

Set to select 12 clock periods per peripheral clock cycle

CPU clock

Clear to select 12 clock periods per machine cycle (STD mode) for CPU and all the

0

X2 peripherals.

Set to select 6clock periods per machine cycle (X2 mode) and to enable the

individual peripherals "X2" bits.

Reset Value = X000 0000b

Not bit addressable

12 T89C51RD2

4243G–8051–05/03

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