參數(shù)資料
型號: MC68HC08QY2CDTE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封裝: 0.65 MM PITCH, LEAD FREE, TSSOP-16
文件頁數(shù): 6/176頁
文件大?。?/td> 1124K
代理商: MC68HC08QY2CDTE
MC68HC08QY/QT Family Data Sheet, Rev. 2
Freescale Semiconductor
103
Chapter 13
System Integration Module (SIM)
13.1 Introduction
This section describes the system integration module (SIM), which supports up to 24 external and/or
internal interrupts. Together with the central processor unit (CPU), the SIM controls all microcontroller unit
(MCU) activities. A block diagram of the SIM is shown in Figure 13-1. The SIM is a system state controller
that coordinates CPU and exception timing.
The SIM is responsible for:
Bus clock generation and control for CPU and peripherals
Stop/wait/reset/break entry and recovery
Internal clock control
Master reset control, including power-on reset (POR) and computer operating properly (COP)
timeout
Interrupt control:
Acknowledge timing
Arbitration control timing
Vector address generation
CPU enable/disable timing
13.2 RST and IRQ Pins Initialization
RST and IRQ pins come out of reset as PTA3 and PTA2 respectively. RST and IRQ functions can be
activated by programing CONFIG2 accordingly. Refer to Chapter 5 Configuration Register (CONFIG).
Table 13-1. Signal Name Conventions
Signal Name
Description
BUSCLKX4
Buffered clock from the internal, RC or XTAL oscillator circuit.
BUSCLKX2
The BUSCLKX4 frequency divided by two. This signal is again
divided by two in the SIM to generate the internal bus clocks
(bus clock = BUSCLKX4 ÷ 4).
Address bus
Internal address bus
Data bus
Internal data bus
PORRST
Signal from the power-on reset module to the SIM
IRST
Internal reset signal
R/W
Read/write signal
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