The special function register TMOD is the working mode register of T0 and T1, and its format is as follows:
The lower 4 bits of TMOD are the mode field of T0, and the upper 4 bits are the mode field of T1, and their meanings are exactly the same.
The working mode selection bits M1, M0 (mode 0~3)
timing mode and external event counting mode selection bits C/T
C/T=1 is the external event counting mode.
Gate bit GATE
When GATE is 1, the timer count is controlled by the external pin input level (INT0 controls the operation of T0, INT1 controls the operation of T1); when GATE is 0, the timer count is not controlled by the external pin input level.
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