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參數(shù)資料
| 型號(hào)： | MC68HC05LJ5P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 42/81頁(yè) |
| 文件大?。?/td> | 905K |
| 代理商： | MC68HC05LJ5P |
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November 10, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05LJ5
MULTI-FUNCTION TIMER
MOTOROLA
REV 1
8-1
SECTION 8
MULTI-FUNCTION TIMER
The MC68HC05LJ5 timer is a 15-stage multi-function ripple counter. The features
include Timer Over Flow (TOF), Power-On Reset (POR), Real Time Interrupt
(RTI), and COP Watchdog Timer.
Figure 8-1. Multi-Function Timer Block Diagram
As shown in Figure 8-1, the Timer is driven by the timer clock, NTF1, divided by
four (4). NTF1 has the same phase and frequency as the processor bus clock,
PH2, but is not stopped by the WAIT or HALT Modes. This signal drives an 8-bit
ripple counter. The value of this 8-bit ripple counter can be read by the CPU at any
time by accessing the Timer Counter Register (TCR) at address $09. A timer over-
RTI Select Circuit
Overflow
Circuit
Detect
88
fOP÷2
2
÷210
Internal
Timer Clock
(NTF1)
TOF
RTIF
TOFE
RTIE
RT1
RT0
RTIFR
TOFR
Timer Control & Status Register ($08)
Timer Counter Register ($09)
Interrupt Circuit
COP Watchdog
Resetable Timer
(÷8)
7-bit counter
MCU Internal Bus
to CPU interrupt
÷214
÷215
÷217
÷216
÷4
to reset logic
COP
clear
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