c8051f410 Silicon Laboratories, c8051f410 Datasheet - Page 239
c8051f410
Manufacturer Part Number
c8051f410
Description
2.0 V, 32/16 Kb Flash, Smartclock, 12-bit Adc
Manufacturer
Silicon Laboratories
Datasheet
1.C8051F410.pdf
(270 pages)
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24.2. Timer 2
Timer 2 is a 16-bit timer formed by two 8-bit SFRs: TMR2L (low byte) and TMR2H (high byte). Timer 2 may
operate in 16-bit auto-reload mode or (split) 8-bit auto-reload mode. The T2SPLIT bit (TMR2CN.3) defines
the Timer 2 operation mode. Timer 2 can also be used in Capture Mode to measure the smaRTClock clock
frequency or the External Oscillator clock frequency.
Timer 2 may be clocked by the system clock, the system clock divided by 12, or the external oscillator
source divided by 8. The external oscillator source divided by 8 is synchronized with the system clock.
24.2.1. 16-bit Timer with Auto-Reload
When T2SPLIT (TMR2CN.3) is zero, Timer 2 operates as a 16-bit timer with auto-reload. Timer 2 can be
clocked by SYSCLK, SYSCLK divided by 12, or the external oscillator clock source divided by 8. As the
16-bit timer register increments and overflows from 0xFFFF to 0x0000, the 16-bit value in the Timer 2
reload registers (TMR2RLH and TMR2RLL) is loaded into the Timer 2 register as shown in Figure 24.4,
and the Timer 2 High Byte Overflow Flag (TMR2CN.7) is set. If Timer 2 interrupts are enabled (if IE.5 is
set), an interrupt will be generated on each Timer 2 overflow. Additionally, if Timer 2 interrupts are enabled
and the TF2LEN bit is set (TMR2CN.5), an interrupt will be generated each time the lower 8 bits (TMR2L)
overflow from 0xFF to 0x00.
External Clock / 8
SYSCLK / 12
SYSCLK
T2XCLK
0
1
Figure 24.4. Timer 2 16-Bit Mode Block Diagram
M
T
3
H
T
M
3
L
CKCON
M
H
T
2
T
M
0
1
2
L
M
T
1
M
T
0
S
C
A
1
S
C
A
0
TR2
TCLK
Rev. 1.0
Overflow
TMR2L
TMR2RLL TMR2RLH
TMR2L
TMR2H
Reload
C8051F410/1/2/3
T2SPLIT
TF2LEN
T2XCLK
TF2H
TF2L
TR2
Interrupt
239
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