MC68HC08GZ32 Datasheet, PDF (21/320 Pages) Freescale Semiconductor, Inc – Microcontrollers

1.2.2 Features of the CPU08
Features of the CPU08 include:
• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC05)
• 16-bit index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support
MCU Block Diagram
1.3 MCU Block Diagram
Figure 1-2 shows the structure of the MC68HC08GZ32.
1.4 Pin Assignments
Figure 1-3, Figure 1-4, and Figure 1-5 illustrate the pin assignments for the 32-pin LQFP, 48-pin LQFP,
and 64-pin QFP respectively.
1.5 Pin Functions
Descriptions of the pin functions are provided in the following subsections.
1.5.1 Power Supply Pins (V_DD and V_SS)
V_DD and V_SS are the power supply and ground pins. The MCU operates from a single power supply.
Fast signal transitions on MCU pins place high, short-duration current demands on the power supply. To
prevent noise problems, take special care to provide power supply bypassing at the MCU as Figure 1-1
shows. Place the C1 bypass capacitor as close to the MCU as possible. Use a high-frequency-response
ceramic capacitor for C1. C2 is an optional bulk current bypass capacitor for use in applications that
require the port pins to source high current levels.
MCU
V_DD
V_SS
C1
0.1 μF
+
C2
V_DD
Note: Component values shown represent typical applications.
Figure 1-1. Power Supply Bypassing
MC68HC08GZ32 Data Sheet, Rev. 3
Freescale Semiconductor
21