Freescale Semiconductor MC68HC08KH12 - Manual (Page 220)

Advance Information MC68HC(7)08KH12 — Rev. 1.1
220 Freescale Semiconductor
15.2 Introduction
The keyboard module provides twenty independently maskable external
interrupts which are accessible via PTD7-PTD0, PTE3-PTE0 and
PTF7-PTF0. Though the functionality of the three keyboard interrupts on
the three ports is similar, the implementation is quite different. On port-D,
enabling keyboard interrupt on a pin also enables its internal pull-up
device. On port-E, the pull-up device is control by the PEPEx bit resided
in the Port-E Keyboard Interrupt Enable Register (KBEIER). On port-F,
the pull-up device is control by the PFPEx bit resided in the Port-F
Control Register (PFPER).
15.3 Features
• Twenty Keyboard Interrupt Pins with Separate Keyboard Interrupt
Enable Bits and three Keyboard Interrupt Masks.
• Hysteresis Buffers
• Internal Pull-ups.
• Programmable Edge-Only or Edge- and Level- Interrupt Sensitivity
• Exit from Low-Power Modes