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Chapter 2 Port Integration Module (S12XEPIMV1)
MC9S12XE-Family Reference Manual , Rev. 1.07
84
Freescale Semiconductor
Port AD0 and AD1 associated with two 16-channel ATD modules
Port R associated with 1 stardard timer (TIM) module
Port L associated with 4 SCI modules
Port F associated with IIC, SCI and chip select outputs
Most I/O pins can be configured by register bits to select data direction and drive strength, to enable and
select pull-up or pull-down devices.
NOTE
This document assumes the availabitity of all features (208-pin package
option). Some functions are not available on lower pin count package
options. Refer to the pin-out summary in the SOC Guide.
2.1.2
Features
The Port Integration Module includes these distinctive registers:
Data and data direction registers for Ports A, B, C, D, E, K, T, S, M, P, H, J, AD0, AD1, R, L, and
F when used as general-purpose I/O
Control registers to enable/disable pull-device and select pull-ups/pull-downs on Ports T, S, M, P,
H, J, R, L, and F on per-pin basis
Control registers to enable/disable pull-up devices on Ports AD0 and AD1 on per-pin basis
Single control register to enable/disable pull-ups on Ports A, B, C, D, E, and K on per-port basis
and on BKGD pin
Control registers to enable/disable reduced output drive on Ports T, S, M, P, H, J, AD0, AD1, R, L,
and F on per-pin basis
Single control register to enable/disable reduced output drive on Ports A, B, C, D, E, and K on
per-port basis
Control registers to enable/disable open-drain (wired-or) mode on Ports S, M, and L
Interrupt flag register for pin interrupts on Ports P, H, and J
Control register to configure IRQ pin operation
Free-running clock outputs
A standard port pin has the following minimum features:
Input/output selection
5V output drive with two selectable drive strengths
5V digital and analog input
Input with selectable pull-up or pull-down device
Optional features supported on dedicated pins:
Open drain for wired-or connections
Interrupt inputs with glitch filtering
Reduced input threshold to support low voltage applications