MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 530

• Manufacturer Part Number: MC9S12E32CFU
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 18 Multiplexed External Bus Interface (MEBIV3)
18.3.2.10 Pull Control Register (PUCR)
Read: Anytime (provided this register is in the map).
Write: Anytime (provided this register is in the map).
This register is used to select pull resistors for the pins associated with the core ports. Pull resistors are
assigned on a per-port basis and apply to any pin in the corresponding port that is currently configured as
an input. The polarity of these pull resistors is determined by chip integration. Please refer to the device
overview chapter to determine the polarity of these resistors.
530
MODC
a
b
0
0
0
0
1
1
1
1
Reset
No writes to the MOD bits are allowed while operating in a secure mode. For more details, refer to the device
overview chapter.
If you are in a special single-chip or special test mode and you write to this register, changing to normal sin-
gle-chip mode, then one allowed write to this register remains. If you write to normal expanded or emulation
mode, then no writes remain.
W
R
1
MODB
PUPKE
0
0
1
1
0
0
1
1
NOTES:
1. The default value of this parameter is shown. Please refer to the device overview chapter to deter-
1
7
mine the actual reset state of this register.
MODA
= Unimplemented or Reserved
0
1
0
1
0
1
0
1
Table 18-8. MODC, MODB, and MODA Write Capability
0
0
6
Figure 18-14. Pull Control Register (PUCR)
Normal expanded narrow
Normal expanded wide
Special single chip
Normal single chip
MC9S12E128 Data Sheet, Rev. 1.07
Special peripheral
Emulation narrow
Emulation wide
Special test
0
0
5
Mode
PUPEE
1
4
3
0
0
write anytime but not to 110
MODB and MODA write once
write anytime but not to 110
MODC, MODB, and MODA
MODC, MODB, and MODA
MODx Write Capability
MODC write never,
2
0
0
but not to 110
a
No write
No write
No write
No write
No write
Freescale Semiconductor
PUPBE
0
1
(2)
b
PUPAE
0
0