peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 40

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
Table 1-7 Input / Output Port
Pin
No.
83
84
85
86
Mode 0: General Purpose I/O Port
83
84
85
86
Mode 1: SACCO-B0 Support Lines
83
84
Symbol
IOP0
IOP1
IOP2
IOP3
PORT0
PORT1
PORT2
PORT3
DRQTB0 O
DRQRB0 O
In (I)
Out (O)
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
During
Reset
I
I
I
I
I
I
I
I
Function
The I/O port is multifunctional and can be
programmed to 3 different modes of use:
Mode 0: General Purpose I/O Port
Mode 1: SACCO-B0 support lines.
Mode 2: UART support lines
Note: The signal names change accordingly.
General purpose I/O lines
During and after reset: Mode 0
DMA-ReQuest Transmitter SACCO Channel B0
The transmitter of HDLC-Channel SACCO
requests a DMA-data transfer by activating this
line. The DRQT-pin remains “high” as long as the
transmit FIFO requires data transfers. The
number of data bytes to be transferred from
system memory to the FIFO must be written first
into the XBCH, XBCL registers (byte count
registers).
DMA-ReQuest Receiver Channel B0
The receiver of SACCO Channel requests a
DMA-data transfer by activating this line. The
DRQR-pin remains “high” as long as the receiver
FIFO requires data transfers. Only blocks of 32,
16, 8 or 4 bytes are transferred.
1-20
PEB 20560
Overview
2003-08