参数资料
型号: MC68HC05C12AB
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, PDIP42
封装: SHRINK, PLASTIC, DIP-42
文件页数: 115/156页
文件大小: 3848K
代理商: MC68HC05C12AB
Timer
Timer During Wait Mode
MC68HC05C12A Rev. 3.0
General Release Specification
Timer
NON-DISCLOSURE
AGREEMENT
REQUIRED
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.
2. The LSB of the free-running counter is read but not for the purpose
of servicing the flag.
The counter alternate register at addresses $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.
8.8 Timer During Wait Mode
The CPU clock halts during wait mode, the timer remains active. If
interrupts are enabled, a timer interrupt will cause the processor to exit
the wait mode.
8.9 Timer During Stop Mode
In 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 at least one valid input capture edge occurs at the
TCAP pin, the input capture detect circuit is armed. This does not set any
timer flags or wake up the MCU. But if the MCU exits stop due to an
external interrupt, there is an active input capture flag and data from the
first valid edge that occurred during the stop mode. If reset is used to exit
stop mode, then no input capture flag or data remains, even if a valid
input capture edge occurred.
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
MPC8280ZQMIBX 32-BIT, 266 MHz, RISC PROCESSOR, PBGA516
MPC8275CVRMIBX 32-BIT, 266 MHz, RISC PROCESSOR, PBGA516
M38268MCA-XXXFP 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100
MB95R107APFV 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP64
MC68HC908EY8ACFAE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
相关代理商/技术参数
参数描述
MC68HC05C12B 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS
MC68HC05C12CP 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS
MC68HC05C12P 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNITS
MC68HC05C4 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:8-Bit Microcomputers
MC68HC05C8 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:PROGRAMMING REFRERENCE GUIDE