System Interface Unit (SIU)
MPC5553/MPC5554 Microcontroller Reference Manual,
Rev. 5
6-4
Freescale Semiconductor
6.2
External Signal Description
lists the external pins used by the SIU.
6.2.1
Detailed Signal Descriptions
6.2.1.1
Reset Input (RESET)
The RESET pin is an active-low input. The RESET pin is asserted by an external device during a power-on
or external reset. The internal reset signal asserts only if the RESET pin asserts for 10 clock cycles.
Assertion of the RESET pin while the device is in reset causes the reset cycle to start over. The RESET
pin has a glitch detector that detects spikes greater than two clock cycles in duration that fall below the
switch point of the input buffer logic of the V
DDEH
input pins. The switch point lies between the maximum
V
IL
and minimum V
IH
specifications for the V
DDEH
input pins.
Table 6-1. SIU Signal Properties
Signal Name
Signal Function
I/O
Type
Pad
Type
Pull
Up/Down
1
1
Internal weak pullup/down. The reset weak pullup/down state is given by the pullup/down state for the primary
pin function. For example, the reset weak pullup/down state of the BOOTCFG[0]_GPIO[211] pin is weak pullup
enabled.
Resets
RESET
Reset Input
Input
—
Up
RSTOUT
Reset Output
Output
Slow
—
System Configuration
GPIO[0:210]
2
2
The GPIO and IRQ signals are multiplexed with other functions on the chip.
General-Purpose I/O
I/O
Slow
Up/Down
BOOTCFG[0]_
3
GPIO[211]
3
BOOTCFG[0] is not available on the 208 package.
Boot Configuration Input
General-Purpose I/O
Input
I/O
Slow
Down
Up/Down
BOOTCFG[1]_
GPIO[212]
Boot Configuration Input /
General-Purpose I/O
Input
I/O
Slow
Down
Up/Down
WKPCFG
GPIO[213]
Weak Pull Configuration Pin /
General-Purpose I/O
Input
I/O
Slow
Up
Up/Down
External Interrupt
MPC5553 IRQ[1:5, 7:15]
MPC5554 IRQ[0:15]
External Interrupt Request Input
Input
Slow
—
4
4
The weak pullup/down state at reset for the IRQ signals depends on the muxed signals that share the pin. The
weak pullup/down state for the IRQ pins is as follows:
IRQ[0, 1, 4, 5, 6, 7,12,13,14]: Up
IRQ[2, 3, 15]: Down
IRQ[8:11]:
WKPCFG
Summary of Contents for MPC5553
Page 5: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 2 Freescale Semiconductor...
Page 21: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 xvi Freescale Semiconductor...
Page 47: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 1 26 Freescale Semiconductor...
Page 163: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 4 20 Freescale Semiconductor...
Page 179: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 5 16 Freescale Semiconductor...
Page 561: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 13 38 Freescale Semiconductor...
Page 615: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 14 54 Freescale Semiconductor...
Page 707: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 17 68 Freescale Semiconductor...
Page 755: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 18 48 Freescale Semiconductor...
Page 873: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 19 118 Freescale Semiconductor...
Page 984: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 Freescale Semiconductor 21 41...
Page 985: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 21 42 Freescale Semiconductor...
Page 1019: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 22 34 Freescale Semiconductor...
Page 1129: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 25 90 Freescale Semiconductor...