MC68HC812A4 Datasheet, PDF (151/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Key Wakeups
Key Wakeup Registers
It is best to clear the flags after initializing this register because changing
the polarity of a bit can cause the associated flag to set.
KPOLJ7–KPOLJ0 — Key Wakeup Port J Polarity Select Bits
1 = Rising edge on the associated port J pin sets the associated
flag bit in the KWIFJ register.
0 = Falling edge on the associated port J pin sets the associated
flag bit in the KWIFJ register.
9.3.14 Port J Pullup/Pulldown Select Register
Address: $002D
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PUPSJ7 PUPSJ6 PUPSJ5 PUPSJ4 PUPSJ3 PUPSJ2 PUPSJ1 PUPSJ0
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 9-14. Port J Pullup/Pulldown Select Register (PUPSJ)
Read: Anytime
Write: Anytime
Each bit in the register corresponds to a port J pin. Each bit selects a
pullup or pulldown device for the associated port J pin. The pullup or
pulldown is active only if enabled by the PULEJ register.
PUPSJ should be initialized before enabling the pullups/pulldowns
(PUPEJ).
PUPSJ7–PUPSJ0 — Key Wakeup Port J Pullup/Pulldown Select Bits
1 = Pullup is selected for the associated port J pin.
0 = Pulldown is selected for the associated port J pin.
Advance Information
MOTOROLA
Key Wakeups
MC68HC812A4 — Rev. 3.0
151