MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 187

• Manufacturer Part Number: MC68HC908GR8CD
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908GR8CD

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 384 B
• Operating Supply Voltage: 3 V to 5 V
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Data Rom Size: 64 KB
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 21
• Program Memory Type: Flash

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
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