Block Diagram - NXP Semiconductors MC9S08SU16 Reference Manual

• Wait mode: The module continues to operate when the core is in Wait mode and can
provide a wakeup interrupt.
• Stop mode: The module is inactive in Stop3 mode for reduced power consumption,
except that address matching is enabled in Stop3 mode. The STOP instruction does
not affect the I2C module's register states.

21.2.3 Block diagram

The following figure is a functional block diagram of the I2C module.
Module Enable
ADDR_DECODE
CTRL_REG
NXP Semiconductors
Address
FREQ_REG ADDR_REG
Input
Sync
START
STOP
Arbitration
Control
Clock
Control
SCL
Figure 21-1. I2C Functional block diagram
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 21 Inter-Integrated Circuit (I2C)
Interrupt
STATUS_REG
In/Out
Data
Shift
Register
Address
Compare
SDA
Write/Read
DATA_MUX
DATA_REG
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