MC68908GZ8MFJE Datasheet, PDF (213/314 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 16
System Integration Module (SIM)
16.1 Introduction
This section describes the system integration module (SIM). 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 16-1. Table 16-1 is a summary of the SIM input/output (I/O) registers. The SIM is a system state
controller that coordinates CPU and exception timing.
STOP/WAIT
CONTROL
SIM
COUNTER
MODULE STOP
MODULE WAIT
CPU STOP (FROM CPU)
CPU WAIT (FROM CPU)
SIMOSCEN (TO CGM)
CGMXCLK (FROM CGM)
CGMOUT (FROM CGM)
÷2
RESET
PIN LOGIC
V_DD
INTERNAL
PULLUP
DEVICE
CLOCK
CONTROL
CLOCK GENERATORS
POR CONTROL
RESET PIN CONTROL
SIM RESET STATUS REGISTER
MASTER
RESET
CONTROL
RESET
INTERNAL CLOCKS
FORCED MONITOR MODE ENTRY
LVI (FROM LVI MODULE)
ILLEGAL OPCODE (FROM CPU)
ILLEGAL ADDRESS (FROM ADDRESS
MAP DECODERS)
COP (FROM COP MODULE)
INTERRUPT CONTROL
AND PRIORITY DECODE
INTERRUPT SOURCES
CPU INTERFACE
Figure 16-1. SIM Block Diagram
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Freescale Semiconductor
213