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C8051T610/1/2/3/4/5/6/7
25.3.2. 8-bit Timers with Auto-Reload
When T3SPLIT is set, Timer 3 operates as two 8-bit timers (TMR3H and TMR3L). Both 8-bit timers oper-
ate in auto-reload mode as shown in Figure 25.7. TMR3RLL holds the reload value for TMR3L; TMR3RLH
holds the reload value for TMR3H. The TR3 bit in TMR3CN handles the run control for TMR3H. TMR3L is
always running when configured for 8-bit Mode.
Each 8-bit timer may be configured to use SYSCLK, SYSCLK divided by 12, or the external oscillator clock
source divided by 8. The Timer 3 Clock Select bits (T3MH and T3ML in CKCON) select either SYSCLK or
the clock defined by the Timer 3 External Clock Select bit (T3XCLK in TMR3CN), as follows:
T3MH
0
0
1
T3XCLK
0
1
X
TMR3H Clock Source
SYSCLK / 12
External Clock / 8
SYSCLK
T3ML
0
0
1
T3XCLK
0
1
X
TMR3L Clock Source
SYSCLK / 12
External Clock / 8
SYSCLK
The TF3H bit is set when TMR3H overflows from 0xFF to 0x00; the TF3L bit is set when TMR3L overflows
from 0xFF to 0x00. When Timer 3 interrupts are enabled, an interrupt is generated each time TMR3H over-
flows. If Timer 3 interrupts are enabled and TF3LEN (TMR3CN.5) is set, an interrupt is generated each
time either TMR3L or TMR3H overflows. When TF3LEN is enabled, software must check the TF3H and
TF3L flags to determine the source of the Timer 3 interrupt. The TF3H and TF3L interrupt flags are not
cleared by hardware and must be manually cleared by software.
T3XCLK
SYSCLK / 12
0
T3MH
TMR3RLH
Reload
To SMBus
0
External Clock / 8
1
1
TR3
TCLK
TMR3H
TF3H
TF3L
TF3LEN
Interrupt
T3SPLIT
SYSCLK
T3ML
TMR3RLL
Reload
TR3
T3XCLK
1
TCLK
TMR3L
To ADC
0
Figure 25.7. Timer 3 8-Bit Mode Block Diagram
186
Rev 1.1
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相关PDF资料
C8051T630DB20
BOARD SOCKET DAUGHTER 20-QFN
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