C8051F326 Datasheet, PDF (132/140 Pages) List of Unclassifed Manufacturers – Full Speed USB, 16 kB Flash MCU Family

C8051F326/7
14.1.4. Mode 3: Two 8-bit Timers (Timer 0 Only)
In Mode 3, Timer 0 is configured as two separate 8-bit timers held in TL0 and TH0. The counter in TL0 is
controlled using the Timer 0 control/status bits in TCON and TMOD: TR0, C/T0, GATE0 and TF0. TL0 can
use either the system clock or an external input signal as its timebase. The TH0 register is restricted to a
timer function sourced by the system clock or prescaled clock. TH0 is enabled using the Timer 1 run con-
trol bit TR1. TH0 sets the Timer 1 overflow flag TF1 on overflow and thus controls the Timer 1 interrupt.
Timer 1 is inactive in Mode 3. When Timer 0 is operating in Mode 3, Timer 1 can be operated in Modes 0,
1 or 2, but cannot set the TF1 flag and generate an interrupt. However, the Timer 1 overflow can be used to
generate baud rates for the UART. While Timer 0 is operating in Mode 3, Timer 1 run control is handled
through its mode settings. To run Timer 1 while Timer 0 is in Mode 3, set the Timer 1 Mode as 0, 1, or 2. To
disable Timer 1, configure it for Mode 3.
CKCON
TTSS
1 0CC
MMA A
10
Pre-scaled Clock
0
TMOD
GCT TGCT T
A / 11A / 00
T T MM T T MM
E110E010
1
0
SYSCLK
1
TR0
GATE0
/INT0
TR1
TH0
(8 bits)
TL0
(8 bits)
Figure 14.3. T0 Mode 3 Block Diagram
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
Interrupt
Interrupt
132
Rev. 0.5