參數(shù)資料
型號: MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 95/145頁
文件大?。?/td> 673K
代理商: MC68HC05CL48
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
TIMER
MOTOROLA
REV 2.0
8-1
SECTION 8
TIMER
The MC68HC05CL48 has three timers:
16-bit free-running timer
15-stage multi-functional (core) timer
One second timer
8.1
16-BIT FREE-RUNNING TIMER
The 16-bit free-running counter is driven by a xed divide-by-four prescaler. This
timer can be used for many purposes, including input waveform measurements
while simultaneously generating an output waveform. Pulse widths can vary from
several microseconds to many seconds. Refer to Figure 8-1 for a timer block
diagram.
Because the timer has a 16-bit architecture, each specic functional segment
(capability) is represented by two registers. These registers contain the high and
low byte of that functional segment. Generally, accessing the low byte of a specic
timer function allows full control of that function; however, an access of the high
byte inhibits that specic timer function until the low byte is also accessed.
NOTE
The I bit in the CCR should be set while manipulating both the high
and low byte register of a specic timer function to ensure that an
interrupt does not occur.
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