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MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1

Freescale Semiconductor

105

Chapter 11

Programmable Timer

11.1 Introduction

The MC68HC705JJ7/MC68HC705JP7 MCU contains a 16-bit programmable timer with an input capture

function and an output compare function as shown by the block diagram in Figure 11-1.

The basis of the capture/compare timer is a 16-bit free-running counter which increases in count with

every four internal bus clock cycles. The counter is the timing reference for the input capture and output

compare functions. The input capture and output compare functions provide a means to latch the times

at which external events occur, to measure input waveforms, and to generate output waveforms and

timing delays. Software can read the value in the 16-bit free-running counter at any time without affecting

the counter sequence.

The input/output (I/O) registers for the input capture and output compare functions are pairs of 8-bit

registers, because of the 16-bit timer architecture used. Each register pair contains the high and low bytes

of that function. 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 is also

accessed.

Because the counter is 16 bits long and preceded by a fixed divide-by-four prescaler, the counter rolls

over every 262,144 internal clock cycles (every 524,288 oscillator clock cycles). Timer resolution with a

4-MHz crystal oscillator is 2 microseconds/count.

The interrupt capability, the input capture edge, and the output compare state are controlled by the timer

control register (TCR) located at $0012, and the status of the interrupt flags can be read from the timer

status register (TSR) located at $0013.

相关代理商/技术参数	参数描述
MC705JP7CPE	制造商:Freescale Semiconductor 功能描述:IC 8BIT MCU 68HC05 2.1MHZ DIP-28
MC705K1CP	制造商:Motorola Inc 功能描述:16 PIN DIP INTEGRATED CIRCUIT
MC705L16CFUE	功能描述:8位微控制器 -MCU 8B MCU W/ EPROM RoHS:否制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
MC705P6ACDWE	功能描述:8位微控制器 -MCU MCU 176 BYTES RAM A/D RoHS:否制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
MC705P6ACDWE	制造商:Freescale Semiconductor 功能描述:8-Bit Microcontroller IC

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