peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 202

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

Semiconductor Group
2.15
The General Purpose I/O Port (GPIO) is multifunctional system. GPIO has three working
modes. GPIO can provide the I/O port unit, the SACCO-B0 unit or the UART unit. GPIO
has four ports. Each port has special purpose
2.15.1
In I/O port mode each port can be configure as input port or as output port. When the
data changes on input port, the DOC sends an interrupt.
The Version 2.1 provides a mask register VINTMASK thus changes of the port values
do not lead to CPU interrupt generation.
Interrupt Mask Register for GPIO (VINTMASK)
Address 328A
Read / Write
Reset Value 00
bit
VINTMASK
Note: Bits 7…4 are not used, and are read as ‘0’.
MP3…0
2.15.2
When GPIO is configured to SACCO-B0 mode:
• SACCO-B0 drives DRQTB0 signal (dma transmit request) trough port0.
• SACCO-B0 drives DRQRB0 (dma receive request) signal trough port1.
• SACCO-B0 gets DACKB0 (dma acknowledge) signal trough port2.
• SACCO-B0 gets HFSCB0 (external frame synchronization clock) signal trough port3.
2.15.3
When GPIO configure to uart mode:
• UART gets DSR (data set ready) signal trough port0.
• UART drives DTR (data transmit ready) signal trough port1.
• UART gets RI (ring indicator) signal trough port2.
• UART gets DCD (data carrier detect) signal trough port3.
The GPIO interrupt is reset when the VDATR register is read.
General Purpose I/O Port (GPIO)
I/O Port Support Lines (Mode 0)
SACCO-B0 Support Lines (Mode 1)
UART Support Lines (Mode 2)
H
Mask I/O Port 3 to 0 bits
‘0’ = the interrupt is enabled (the interrupt is not masked)
‘1’ = the interrupt is disabled (the interrupt is masked)
H
7
0
0
0
2-156
4
0
3
MP3
Functional Block Description
2
MP2
1
MP1
PEB 20560
0
2003-08
MP0