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Chapter 20 System Integration Unit Lite (SIUL)
MPC5606BK Microcontroller Reference Manual, Rev. 2
372
Freescale Semiconductor
Table 20-21. IFCPR field descriptions
20.6
Functional description
20.6.1
Pad control
The SIUL controls the configuration and electrical characteristic of the device pads. It provides a
consistent interface for all pads, both on a by-port and a by-bit basis. The pad configuration registers
(PCR
n
, see
Section 20.5.3.8, Pad Configuration Registers (PCR0–PCR148)
) allow software control of the
static electrical characteristics of external pins with a single write. These are used to configure the
following pad features:
•
Open drain output enable
•
Slew rate control
•
Pull control
•
Pad assignment
•
Control of analog path switches
•
Safe mode behavior configuration
20.6.2
General purpose input and output pads (GPIO)
The SIUL manages as many as 149 GPIO pads organized as ports that can be accessed for data reads and
writes as 32-, 16-, or 8-bit
1
.
NOTE
Ports are organized as groups of 16 GPIO pads, with the exception of Port J,
which has 5. A 32-bit R/W operation accesses two ports simultaneously. A
16-bit operation accesses a full port and an 8-bit access either the upper or
lower byte of a port.
As shown in
, all port accesses are identical with each read or write being performed only at
a different location to access a different port width.
Field
Description
IFCP
Interrupt Filter Clock Prescaler setting
Prescaled Filter Clock Period = T(FIRC) × (IFCP + 1)
T(FIRC) is the fast internal RC oscillator period.
IFCP can be 0 to 15.
1.There are exceptions. Some pads, e.g., precision analog pads, are input only.
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