Final answer:
To configure Timer 1 to operate in split-pair mode, set the Timer Control Register (T1CON) with the appropriate configuration argument.
Step-by-step explanation:
To configure Timer 1 to operate in split-pair mode with Timer A as a periodic counter and Timer B as a one-shot counter that counts up, you need to set the Timer Control Register (T1CON) appropriately.
The configuration argument for T1CON in split-pair mode is '11 11 0111 0'
So the configuration for Timer 1 in split-pair mode would be: T1CON = 0x770