C8051F360/1/2/3/4/5/6/7/8/9
SFR Definition 21.13. TMR3CN: Timer 3 Control
SFR Page:
all pages
SFR Address: 0x91
R/W
R/W
R/W
R/W
R/W
R/W
TR3
Bit2
R
–
R/W
Reset Value
TF3H
Bit7
TF3L
Bit6
TF3LEN TF3CEN T3SPLIT
T3XCLK 00000000
Bit5
Bit4
Bit3
Bit1
Bit0
Bit 7:
TF3H: Timer 3 High Byte Overflow Flag.
Set by hardware when the Timer 3 high byte overflows from 0xFF to 0x00. In 16 bit mode,
this will occur when Timer 3 overflows from 0xFFFF to 0x0000. When the Timer 3 interrupt is
enabled, setting this bit causes the CPU to vector to the Timer 3 interrupt service routine.
TF3H is not automatically cleared by hardware and must be cleared by software.
TF3L: Timer 3 Low Byte Overflow Flag.
Set by hardware when the Timer 3 low byte overflows from 0xFF to 0x00. When this bit is
set, an interrupt will be generated if TF3LEN is set and Timer 3 interrupts are enabled. TF3L
will set when the low byte overflows regardless of the Timer 3 mode. This bit is not automat-
ically cleared by hardware.
Bit 6:
Bit 5:
Bit 4:
TF3LEN: Timer 3 Low Byte Interrupt Enable.
This bit enables/disables Timer 3 Low Byte interrupts. If TF3LEN is set and Timer 3 inter-
rupts are enabled, an interrupt will be generated when the low byte of Timer 3 overflows.
0: Timer 3 Low Byte interrupts disabled.
1: Timer 3 Low Byte interrupts enabled.
TF3CEN: Timer 3 Low-Frequency Oscillator Capture Enable.
This bit enables/disables Timer 3 Low-Frequency Oscillator Capture Mode. If TF3CEN is set
and Timer 3 interrupts are enabled, an interrupt will be generated on a rising edge of the
low-frequency oscillator output, and the current 16-bit timer value in TMR3H:TMR3L will be
copied to TMR3RLH:TMR3RLL. See Section “16. Oscillators” on page 169 for more details.
0: Timer 3 Low-Frequency Oscillator Capture disabled.
1: Timer 3 Low-Frequency Oscillator Capture enabled.
Bit 3:
Bit 2:
T3SPLIT: Timer 3 Split Mode Enable.
When this bit is set, Timer 3 operates as two 8-bit timers with auto-reload.
0: Timer 3 operates in 16-bit auto-reload mode.
1: Timer 3 operates as two 8-bit auto-reload timers.
TR3: Timer 3 Run Control.
This bit enables/disables Timer 3. In 8-bit mode, this bit enables/disables TMR3H only;
TMR3L is always enabled in this mode.
0: Timer 3 disabled.
1: Timer 3 enabled.
Bit 1:
Bit 0:
UNUSED. Read = 0b. Write = don’t care.
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 external clock selection is the system clock divided by 12.
1: Timer 3 external clock selection is the external clock divided by 8. Note that the external
oscillator source divided by 8 is synchronized with the system clock.
262
Rev. 1.0
SILICON [ SILICON ]
