参数资料
型号: MC68HC05G1B
厂商: MOTOROLA 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: 76/124页
文件大小: 732K
代理商: MC68HC05G1B
MC68HC05G1
MOTOROLA
7-1
PROGRAMMABLE TIMER
7
PROGRAMMABLE TIMER
The timer consists of a 16-bit free-running counter 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. Figure 7-1 shows a block diagram for the Programmable Timer.
Because the timer has a 16-bit architecture, the I/O registers for the input capture and output
compare functions are pairs of 8-bit registers (high byte and low byte). Generally, assessing 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 condition code register 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.
Ten 8-bit registers are associated with the programmable timer.
Timer Control Register (TCR)
$12
Timer Status Register (TSR)
$13
Input Capture Register
High byte - $14, Low byte - $15
Output Compare Register
High byte - $16
Low byte - $17
Counter Register
High byte - $18, Low byte - $19
Alternate Counter Register
High byte - $1A, Low byte - $1B
A description of each register is provided in the following paragraphs.
TPG
51
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