參數(shù)資料
型號(hào): MC68HC05P4ACP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁(yè)數(shù): 29/72頁(yè)
文件大?。?/td> 400K
代理商: MC68HC05P4ACP
MC68HC05P4A Data Sheet, Rev. 7.1
Freescale Semiconductor
35
Chapter 8
Timer
8.1 Introduction
The timer consists of a 16-bit, software-programmable counter driven by a fixed 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.
Figure 8-1. Timer Block Diagram
Each specific 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 specific timer function
allows full control of that function; however, an access of the high byte inhibits that specific timer function
until the low byte also is accessed.
EDGE
INPUT
(TCAP)
INPUT
CAPTURE
REGISTER
CLOCK
INTERNAL BUS
OUTPUT
COMPARE
REGISTER
HIGH
BYTE
LOW
BYTE
$16
$17
/4
INTERNAL
PROCESSOR
16-BIT FREE
RUNNING
COUNTER
ALTERNATE
REGISTER
8-BIT
BUFFER
HIGH
BYTE
LOW
BYTE
$1A
$1B
$18
$19
HIGH
BYTE
LOW
BYTE
$14
$15
OUTPUT
COMPARE
CIRCUIT
OVERFLOW
DETECT
CIRCUIT
EDGE
DETECT
CIRCUIT
TIMER
STATUS
REG.
ICF OCF TOF
$13
ICIE
IEDG OLVL
OUTPUT
LEVEL
REG.
RESET
TIMER
CONTROL
REG.
$12
OUTPUT
LEVEL
(TCMP)
INTERRUPT
CIRCUIT
TOIE
OCIE
D
CLK
C
Q
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