mc68hc908gr8vp Freescale Semiconductor, Inc, mc68hc908gr8vp Datasheet - Page 187
mc68hc908gr8vp
Manufacturer Part Number
mc68hc908gr8vp
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GR8VP.pdf
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Chapter 19
System Integration Module (SIM)
19.1 Introduction
This section describes the system integration module (SIM). Together with the CPU, the SIM controls all
MCU activities. A block diagram of the SIM is shown in
input/output (I/O) registers. The SIM is a system state controller that coordinates CPU and exception
timing. The SIM is responsible for:
Table 19-1
Freescale Semiconductor
•
•
•
Bus clock generation and control for CPU and peripherals:
–
–
Master reset control, including power-on reset (POR) and COP timeout
Interrupt arbitration:
Stop/wait/reset/break entry and recovery
Internal clock control
shows the internal signal names used in this section.
Signal Name
CGMXCLK
CGMVCLK
CGMOUT
PORRST
IRST
R/W
IAB
IDB
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Buffered version of OSC1 from clock generator module (CGM)
PLL output
PLL-based or OSC1-based clock output from CGM module
(Bus clock = CGMOUT divided by two)
Internal address bus
Internal data bus
Signal from the power-on reset module to the SIM
Internal reset signal
Read/write signal
Table 19-1. Signal Name Conventions
Description
Figure
19-1.
Table 19-1
is a summary of the SIM
187
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