C8051F850-C-GM Datasheet, PDF (298/328 Pages) Silicon Laboratories – Low-Cost 8-bit MCU Family with up to 8 kB of Flash

Table 25.15. TMR3CN Register Bit Descriptions
Bit
Name
Function
0
T3XCLK Timer 3 External Clock Select.
This bit selects the external clock source for Timer 3. If Timer 3 is in 8-bit mode, this bit
selects the external oscillator clock source for both timer bytes. However, the Timer 3
Clock Select bits (T3MH and T3ML in register CKCON) may still be used to select
between the external clock and the system clock for either timer.
0: Timer 3 clock is the system clock divided by 12.
1: Timer 3 clock is the external clock divided by 8 (synchronized with SYSCLK).
270
Rev. 1.0