C8051F326 Datasheet, PDF (131/140 Pages) List of Unclassifed Manufacturers – Full Speed USB, 16 kB Flash MCU Family

C8051F326/7
14.1.2. Mode 1: 16-bit Timer
Mode 1 operation is the same as Mode 0, except that the timer registers use all 16 bits. The timers are
enabled and configured in Mode 1 in the same manner as for Mode 0.
14.1.3. Mode 2: 8-bit Timer with Auto-Reload
Mode 2 configures Timer 0 and Timer 1 to operate as 8-bit timers with automatic reload of the start value.
TL0 holds the count and TH0 holds the reload value. When the counter in TL0 overflows from all ones to
0x00, the timer overflow flag TF0 (TCON.5) is set and the counter in TL0 is reloaded from TH0. If Timer 0
interrupts are enabled, an interrupt will occur when the TF0 flag is set. The reload value in TH0 is not
changed. TL0 must be initialized to the desired value before enabling the timer for the first count to be cor-
rect. When in Mode 2, Timer 1 operates identically to Timer 0.
Both timers are enabled and configured in Mode 2 in the same manner as Mode 0. Setting the TR0 bit
(TCON.4) enables the timer when GATE0 (TMOD.3) is logic 0 or when GATE0 is logic 1 and the input sig-
nal /INT0 is active (see Section “8.3.2. External Interrupts” on page 59 for details on the external input
signals /INT0 and /INT1).
CKCON
TTSS
1 0CC
MMA A
10
Pre-scaled Clock
0
TMOD
GCT TGCT T
A / 11A / 00
T T MM T T MM
E110E0 10
1
0
SYSCLK
1
TR0
GATE0
/INT0
TCLK
TL0
(8 bits)
TH0
(8 bits)
Reload
Figure 14.2. T0 Mode 2 Block Diagram
TF1
TR1
TF0
Interrupt
TR0
IE1
IT1
IE0
IT0
Rev. 0.5
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