TMOD Register

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TMOD(Timer Mode) is an SFR. The address of this register is 89H. This is not bit-addressable.

Timer
Timer1 Mode
Timer0 Mode
Bit Details
Gate (G)
C/T
M1
M0
Gate (G)
C/T
M1
M0

the following table, we will see the bit details and their different operations for high or low value.

Bit Details
High Value(1)
Low Value(0)
C/T
Configure for the Counter operations
Configure for the Timer operations
Gate (G)
Timer0 or Timer1 will be in RunMode when TRX bit of TCON register is high.
Timer0 or Timer1 will be in RunMode when TRX bit of TCON register is high and INT0 or INT1 is high.
Bit Details
00
01
10
11
M1 M0
This is for Mode 0. (8-bit timer/counter, with 5-bit pre-scaler)
This is Mode 1. (16-bit timer/counter)
This is Mode 3 (8-bit auto reload-timer/counter)
This is Mode 3 (The function depends on Timer0 or Timer1)


The Gate bit will be high when the timer or counter is in mode 0 to 2.

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