MC68HC908QT1VDW Freescale Semiconductor, MC68HC908QT1VDW Datasheet - Page 103

• Manufacturer Part Number: MC68HC908QT1VDW
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908QT1VDW

• Product Category: 8-bit Microcontrollers - MCU
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 1.5 KB
• Data Ram Size: 128 B
• On-chip Adc: No
• Operating Supply Voltage: 3.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-8
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Program Memory Type: Flash
• Factory Pack Quantity: 96
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

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
that coordinates CPU and exception timing.
The SIM is responsible for:
Freescale Semiconductor
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•
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Signal Name
Address bus
BUSCLKX4
BUSCLKX2
PORRST
Data bus
Bus clock generation and control for CPU and peripherals
–
–
Master reset control, including power-on reset (POR) and computer operating properly (COP)
timeout
Interrupt control:
–
–
–
CPU enable/disable timing
IRST
R/W
Stop/wait/reset/break entry and recovery
Internal clock control
Acknowledge timing
Arbitration control timing
Vector address generation
Buffered clock from the internal, RC or XTAL oscillator circuit.
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).
Internal address bus
Internal data bus
Signal from the power-on reset module to the SIM
Internal reset signal
Read/write signal
Table 13-1. Signal Name Conventions
MC68HC908QY/QT Family Data Sheet, Rev. 6
Figure
Description
13-1. The SIM is a system state controller
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