参数资料
型号: MC68HC05RC18P
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 89/126页
文件大小: 1180K
代理商: MC68HC05RC18P
MC68HC05RC18 Rev. 2.1
General Release Specification
Freescale Semiconductor
Core Timer
63
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Release Specification — MC68HC05RC18
Section 8. Core Timer
8.1 Contents
Core Timer Control and Status Register. . . . . . . . . . . . . . . . . . 65
Core Timer Counter Register . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.2 Introduction
The core timer for this device is a 14-stage multifunctional ripple counter.
Features include timer overflow, power-on reset (POR), real-time
interrupt (RTI), and COP watchdog timer.
As seen in Figure 8-1, the internal peripheral clock is divided by four and
then 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 core timer counter
register (CTCR) at address $09. A timer overflow function is
implemented on the last stage of this counter, giving a possible interrupt
rate of the internal peripheral clock (E)/1024. This point is then followed
by three more stages, with the resulting clock (E/4096) driving the real-
time interrupt circuit (RTI). The RTI circuit consists of three divider
stages with a one-of-four selector. The output of the RTI circuit is further
divided by eight to drive the mask optional COP watchdog timer circuit.
The RTI rate selector bits and the RTI and CTOF enable bits and flags
are located in the timer control and status register at location $08.
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