AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 200

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Functional
Description
Figure 76. I/O Line Control Logic
Pull-up Resistor
Control
200
Output Enable
Output Enable
Peripheral A
Peripheral B
Peripheral A
Peripheral B
PIO_BSR[0]
PIO_ASR[0]
AT91SAM7S32 Preliminary
Output
Output
PIO_ABSR[0]
PIO_ODR[0]
PIO_OER[0]
1
1
0
0
The PIO Controller features up to 32 fully-programmable I/O lines. Most of the control logic
associated to each I/O is represented in Figure 76. In this description each signal shown rep-
resents but one of up to 32 possible indexes.
Each I/O line is designed with an embedded pull-up resistor. The value of this resistor is about
100 k
PIO_OSR[0]
PIO_IFER[0]
PIO_IFDR[0]
PIO_SODR[0]
PIO_CODR[0]
(see the product electrical characteristics for more details about this value). The pull-
PIO_IFSR[0]
PIO_PDR[0]
PIO_PER[0]
Glitch
Filter
PIO_ODSR[0]
PIO_PSR[0]
PIO_PDSR[0]
1
0
PIO_IDR[31]
PIO_IER[31]
PIO_IER[0]
PIO_IDR[0]
1
0
1
0
Detector
Edge
PIO_IMR[31]
PIO_ISR[31]
PIO_IMR[0]
PIO_ISR[0]
PIO_MDER[0]
PIO_MDDR[0]
PIO_MDSR[0]
(Up to 32 possible inputs)
1
1
0
0
PIO_PUER[0]
PIO_PUDR[0]
PIO_PUSR[0]
PIO Interrupt
Peripheral B
Peripheral A
Input
Input
6071A–ATARM–28-Oct-04
Pad