收藏本站
参数资料
型号： MC68HC05V7CB
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封装： SDIP-56
文件页数： 157/170页
文件大小： 980K
代理商： MC68HC05V7CB
SECTION 11: 16-BIT TIMER
MOTOROLA
Page 73
MC68HC05V7 Specification Rev. 1.0
11.5.1
ICF - Input Capture Flag
1 - Flag set when selected polarity edge is sensed by input capture edge
detector
0 - Flag cleared when TSR and input capture low register ($15) are
accessed
Reset clears this bit.
11.5.2
OCF - Output Compare Flag
1 - Flag set when output compare register contents match the free-running
counter contents
0 - Flag cleared when TSR and output compare low register ($17) are
accessed
Reset clears this bit.
11.5.3
TOF - Timer Overflow Flag
1 - Flag set when free-running counter transition from $FFFF to $0000
occurs
0 - Flag cleared when TSR and counter low register ($19) are accessed
Reset clears this bit.
11.5.4
Bits 0-4 - Not used
Always read zero.
Accessing the timer status register satisfies the first condition required to clear status bits.
The remaining step is to access the register corresponding to the status bit.
A problem can occur when using the timer overflow function and reading the free-running
counter at random times to measure an elapsed time. Without incorporating the proper
precautions into software, the timer overflow flag could unintentionally be cleared if:
1. The timer status register is read or written when TOF is set, and
2. The MSB of the free-running counter is read but not for the purpose of
servicing the flag.
The counter alternate register at address $1A and $1B contains the same value as the free-
running counter (at address $18 and $19); therefore, this alternate register can be read at
any time without affecting the timer overflow flag in the timer status register.
11.6
TIMER DURING WAIT MODE
The CPU clock halts during the WAIT mode, but the timer remains active if turned on prior
to entering wait mode. If interrupts are enabled, a timer interrupt will cause the processor
to exit the WAIT mode.
11.7
TIMER DURING STOP MODE
In the STOP mode, the timer stops counting and holds the last count value if STOP is exited
by an interrupt. If RESET is used, the counter is forced to $FFFC. During STOP, if the
TIMER is on and at least one valid input capture edge occurs at the TCAP pin, the input
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相关PDF资料
PDF描述
MC68HC711EA9VFS3 8-BIT, UVPROM, 3 MHz, MICROCONTROLLER, CQCC52
MPC7400RX350TX 32-BIT, 350 MHz, RISC PROCESSOR, CBGA360
MPC8250ACVRLHDX 32-BIT, 250 MHz, RISC PROCESSOR, PBGA516
MC68HC11L1VFU2 8-BIT, 2 MHz, MICROCONTROLLER, PQFP64
MC68HC08JL3CP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP28
相关代理商/技术参数
参数描述
MC68HC05X16 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit
MC68HC05X32 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit
MC68HC05X4 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05X4CDW 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC05X4DW 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*