External Signals Description; Register Definition; Memory Map And Registers - NXP Semiconductors MC9S08SU16 Reference Manual

15.3 External signals description

The KBI input pins can be used to detect either falling edges, or both falling edge and
low-level interrupt requests. The KBI input pins can also be used to detect either rising
edges, or both rising edge and high-level interrupt requests.
The signal properties of KBI are shown in the following table:
Signal
KBIPn

15.4 Register definition

The KBI includes following registers:
• A pin status and control register, KBI_SC
• A pin enable register, KBI_PE
• An edge select register, KBI_ES
See the direct-page register summary in the Memory chapter for the absolute address
assignments for all KBI registers. This section refers to registers and control bits only by
their names.
Some MCUs may have more than one KBI, so register names include placeholder
characters to identify which KBI is being referenced.
15.5

Memory Map and Registers

Absolute
address
(hex)
7C KBI Status and Control Register (KBI_SC)
7D KBI Pin Enable Register (KBI_PE)
7E KBI Edge Select Register (KBI_ES)
NXP Semiconductors
Table 15-1. External signals description
Function
Keyboard interrupt pins
KBI memory map
Register name
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 15 Keyboard Interrupts (KBI)
Width
Access Reset value
(in bits)
8 R/W 00h
8 R/W 00h
8 R/W 00h
I/O
I
Section/
page
15.5.1/238
15.5.2/239
15.5.3/239
237