
 1058
SAM4CP [DATASHEET]
43051E–ATPL–08/14
E
Parallel Input/Output Controller (PIO)
“PIO clock” and “PIO controller clock” replaced by “peripheral clock”.
‘MCK’ replaced by ‘peripheral clock’.
Updated 
Figure 32-2
.
Section 32.5.1 “Pull-up and Pull-down Resistor Control” on page 585
 added information on
setting pull-up and pull-down.
Section 32.5.3 “Peripheral A or B or C or D Selection” on page 586
 added information on
products that do not have A, B, C and D peripherals.
Section 32.6.38 “PIO Additional Interrupt Modes Mask Register” on page 633
 updated bit
description.
Serial Peripheral Interface (SPI)
‘MCK’ replaced by ‘peripheral clock’.
Modified 
Section 33.7.3 “Master Mode Operations” on page 650
.
Modified 
Figure 33-1
, 
Figure 33-3
 and 
Figure 33-4
.
Modified 
Section 33.7.3 “Master Mode Operations” on page 650
.
Section 33.8.2 “SPI Mode Register” on page 661
 modified DLYBCS bit description.
Section 33.8.9 “SPI Chip Select Register” on page 670
 added register addresses.
Two-wire Interface (TWI)
‘MCK’ replaced by ‘peripheral clock’.
Table 34-1, “Atmel TWI compatibility with I2C Standard” 
clock synchronization added as
supported feature.
Section 34.7.3.3 “Programming Master Mode” on page 679
 added Note after section.
Section 34.7.3.7 “Using the Peripheral DMA Controller (PDC)” on page 683
 modified “Data
Transmit with the PDC” and “Data Receive with the PDC”.
“Clock Synchronization in Write Mode”: at end of last sentence, changed “in Read mode” to
“in Write mode”.
Section 34.7.3.5 “Master Receiver Mode” on page 681
 removed reference to clock stretching
in the “Warning”. (clock stretching is a slave-only mechanism).
Figure 34-11
 changed title and figure to remove references to clock stretching reference
(slave-only mechanism).
“Clock Stretching Sequence”: added section which refers only to TWI_THR.
“Clock Synchronization/Stretching”: changed the section name and updated.
Universal Asynchronous Receiver Transmitter (UART)
‘MCK’ replaced by ‘peripheral clock’.
Doc. Rev.
43051
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