参数资料
型号: SAF-C515-LN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 134/162页
文件大小: 771K
代理商: SAF-C515-LN
Semiconductor Group
6-30
On-Chip Peripheral Components
C515
Reload of Timer 2
The reload mode for timer 2 is selected by bits T2R0 and T2R1 in SFR T2CON. Figure 6-14 shows
the configuration of timer 2 in reload mode.
Mode 0 : When timer 2 rolls over from all l’s to all 0’s, it not only sets TF2 but also causes the timer
2 registers to be loaded with the 16-bit value in the CRC register, which is preset by
software. The reload will happen in the same machine cycle in which TF2 is set, thus
overwriting the count value 0000H.
Mode 1 : When a 16-bit reload from the CRC register is caused by a negative transition at the
corresponding input pin T2EX/P1.5. In addition, this transition will set flag EXF2, if bit
EXEN2 in SFR IEN1 is set. lf the timer 2 interrupt is enabled, setting EXF2 will generate
an interrupt. The external input pin T2EX is sampled in every machine cycle. When the
sampling shows a high in one cycle and a low in the next cycle, a transition will be
recognized. The reload of timer 2 registers will then take place in the cycle following the
one in which the transition was detected.
Figure 6-14
Timer 2 in Reload Mode
MCS01903
1
Mode 1
EXF2
0
Mode
EXEN2
TF2
CRCH
CRCL
Reload
TH2
TL2
Input
Clock
Timer
Interrupt
Request
T2EX
P1.5
2
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