mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 161

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 12
PS2 Clock Generator (PS2CLK)
12.1 Introduction
This module provides the capability to generate PS2 clock.
12.2 Functional Description
Figure 12-1
PS2EN bit. When the module is enabled, the output port becomes an open-drain output. A two phase
clock is created by the prescaler block, one is driving the clock generator unit and the other is driving the
interrupt generator. The clock generator drives the output port directly if CLKEN bit is set, while the
interrupt generator enables CPU interrupt at the different clock phase. The CPU interrupt can be masked
by clearing the PS2IEN bit. The waveform diagram is shown in
When the module is enabled, the output port status is continuous monitored and stored in PSTATUS flag.
Freescale Semiconductor
PTE2/PS2CLK/D+
shows the block diagram for the PS2 clock generator. The module is enabled by setting
Figure 12-1. PS2 Clock Generator Block Diagram
MC68HC908JW32 Data Sheet, Rev. 5
PSTATUS
CSEL[1:0]
PS2EN
PRE
GENERATOR
CLOCK
CLKEN
PRESCALER
Figure
PS2IEN
PS2IF
12-2.
GENERATOR
INTERRUPT
Bus Clock
CPU
Interrupt
161