at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 266

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

24.2
24.3
24.3.1
266
Block Diagram
Functional Description
AT91SAM9G20 Preliminary
Configuration
Figure 24-1. Block Diagram
The PDC channel user interface enables the user to configure and control data transfers for
each channel. The user interface of each PDC channel is integrated into the associated periph-
eral user interface.
The user interface of a serial peripheral, whether it is full or half duplex, contains four 32-bit
pointers (RPR, RNPR, TPR, TNPR) and four 16-bit counter registers (RCR, RNCR, TCR,
TNCR). However, the transmit and receive parts of each type are programmed differently: the
RECEIVE or TRANSMIT
FULL DUPLEX
HALF DUPLEX
PERIPHERAL
PERIPHERAL
PERIPHERAL
RHR or THR
Control
Control
Control
RHR
THR
THR
RHR
Status & Control
Status & Control
Status & Control
PDC Channel A
PDC Channel B
PDC Channel D
PDC Channel C
PDC
Control
6384B–ATARM–15-Dec-08