Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO データシート
製品コード
ATSAM4L-XPRO
706
42023E–SAM–07/2013
ATSAM4L8/L4/L2
27.5
Application Block Diagram
Figure 27-2. Application Block Diagram
27.6
I/O Lines Description
27.7
Product Dependencies
In order to use this module, other parts of the system must be configured correctly, as described
below.
below.
27.7.1
I/O Lines
TWD and TWCK are bidirectional lines, connected to a positive supply voltage via a current
source or pull-up resistor (see
source or pull-up resistor (see
). When the bus is free, both lines are
high. The output stages of devices connected to the bus must have an open-drain or open-col-
lector to perform the wired-AND function.
lector to perform the wired-AND function.
The TWD and TWCK pins may be multiplexed with I/O Controller lines. To enable the TWIM, the
user must perform the following steps:
user must perform the following steps:
• Program the I/O Controller to:
– Dedicate TWD, TWCK as peripheral lines.
– Define TWD, TWCK as open-drain.
27.7.2
Power Management
If the CPU enters a sleep mode that disables clocks used by the TWIM, the TWIM will stop func-
tioning and resume operation after the system wakes up from sleep mode.
tioning and resume operation after the system wakes up from sleep mode.
TWI
Master
TWD
TWCK
Atmel TWI
serial EEPROM
I
2
C RTC
I
2
C LCD
controller
I
2
C temp
sensor
Slave 2
Slave 3
Slave 4
VDD
Rp: pull-up value as given by the I2C Standard
Slave 1
Rp
Rp
Table 27-4.
I/O Lines Description
Pin Name
Pin Description
Type
TWD
Two-wire Serial Data
Input/Output
TWCK
Two-wire Serial Clock
Input/Output