SAM7S256_14 Datasheet, PDF (296/775 Pages) ATMEL Corporation – ARM-based Flash MCU

29.3 Block Diagram
Figure 29-1. Block Diagram
APB Bridge
PMC
MCK
Two-wire
Interface
PIO
TWI
Interrupt
AIC
TWCK
TWD
29.4 Application Block Diagram
Figure 29-2. Application Block Diagram
Host with
TWI
Interface
TWD
TWCK
Atmel TWI
Serial EEPROM
Slave 1
I²C RTC
Slave 2
Rp: Pull up value as given by the I²C Standard
29.4.1 I/O Lines Description
VDD
Rp
Rp
I²C LCD
Controller
Slave 3
I²C Temp.
Sensor
Slave 4
Table 29-3.
Pin Name
TWD
TWCK
I/O Lines Description
Pin Description
Two-wire Serial Data
Two-wire Serial Clock
Type
Input/Output
Input/Output
29.5 Product Dependencies
29.5.1 I/O Lines
Both TWD and TWCK are bidirectional lines, connected to a positive supply voltage via a current
source or pull-up resistor (see Figure 29-2 on page 296). When the bus is free, both lines are
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
296