mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 113

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 10
Clock Generation Module (CGM)
10.1 Introduction
The clock generation module (CGM) generates the system clocks and generates and controls the timing
of the reset and power-on reset (POR) logic. The CGM is composed of:
10.2 Block Diagram
Freescale Semiconductor
•
•
•
Clock selection and generation circuitry
Slow-mode clock divider
Reset and stop generation timing and control
EXTAL
XTAL
Older device mask sets do not support the slow-mode clock divider feature.
Register $00E0 is reserved in older devices and provides no function.
Mask sets that do not have the slow-mode clock divider feature on the
MC68HC912B32 include: G96P, G86W, and H91F.
Mask sets that do not have the slow-mode clock divider feature on the
MC68HC12BE32 include: H54T and J38M.
Mask sets that do not have the slow-mode clock divider feature on the
MC68HC(9)12BC32 include: J15G.
CONSUMPTION
OSCILLATOR
REDUCED
÷
2
OSCILLATOR
OUT
E AND P CLOCK
GENERATOR
GENERATOR
T CLOCK
Figure 10-1. CGM Block Diagram
M68HC12B Family Data Sheet, Rev. 9.1
CLOCK DIVIDER
SLOW MODE
NOTE
SLOW E CLOCK
SLOW P CLOCK
P CLOCK (GBT)
E CLOCK (GBT)
WAIT
T CLOCK
P CLOCK
E CLOCK
TO BDLC AND TIM
TO BUSES, BDM,
SPI, SCI, ATD, RTI,
COP, PWM, FEE,
EE, RAM
TO CPU
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