XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 150

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

System Integration Module (SIM)
9.3 SIM Bus Clock Control and Generation
9.3.1 Bus Timing
Technical Data
150
Table 9-2
The bus clock generator provides system clock signals for the CPU and
peripherals on the MCU. The system clocks are generated from an
incoming clock, CGMOUT, as shown in
from either an external oscillator or from the on-chip PLL. (See
Generator Module (CGM)
In user mode, the internal bus frequency is either the crystal oscillator
output (CGMXCLK) divided by four or the PLL output (CGMVCLK)
divided by four. (See
Signal Name
CGMXCLK
CGMVCLK
CGMOUT
PORRST
IRST
R/W
IDB
IAB
System Integration Module (SIM)
shows the internal signal names used in this section.
Table 9-1. I/O Register Address Summary
Register
Address
Table 9-2. Signal Name Conventions
Buffered Version of OSC1 from Clock Generator Module
PLL Output
PLL-Based or OSC1-Based Clock Output from CGM Module
Internal Address Bus
Internal Data Bus
Signal from the Power-On Reset Module to the SIM
Internal Reset Signal
Read/Write Signal
(CGM)
(Bus Clock = CGMOUT Divided by Two)
Clock Generator Module (CGM)
$FE00
SBSR
on page 169).
$FE01
SRSR
Figure
Description
MC68HC908AZ60A — Rev 2.0
9-3. This clock can come
SBFCR
$FE03
on page 169).
MOTOROLA
Clock