mc68hc11k4 Freescale Semiconductor, Inc, mc68hc11k4 Datasheet - Page 147

• Manufacturer Part Number: mc68hc11k4
• Description: Mc68hc11k1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

6.11 Internal Pullup Resistors
M68HC11K Family
MOTOROLA
NOTE:
NOTE:
Address: $002C
Address: $003F
M68HC11KS series devices contain selectable internal pullup resistors
for ports B, F, G, and H. The resistors for each port are enabled by
setting the corresponding bit in the PPAR register. PPAR itself must be
enabled by setting the PAREN bit in the system configuration register
(CONFIG). Refer to
xPPUE — Port x Pin Pullup Enable Bits
FPPUE and BPPUE do not apply in expanded mode because port F and
B are address outputs.
CONFIG is writable once in normal modes and writable at any time in
special modes.
PAREN — Pullup Assignment Register Enable Bit
Reset:
Reset:
Read:
Read:
Write:
Write:
Figure 6-18. System Configuration Register (CONFIG)
Figure 6-17. Port Pullup Assignment Register (PPAR)
Only active when enabled by the PAREN bit in the CONFIG register
Freescale Semiconductor, Inc.
For More Information On This Product,
0 = Port x pin on-chip pullup devices disabled
1 = Port x pin on-chip pullup devices enabled
0 = PPAR register disabled
1 = PPAR register enabled; pullups can be enabled through PPAR
ROMAD
Bit 7
Bit 7
—
0
0
Go to: www.freescale.com
Parallel Input/Output
6
0
0
6
1
1
Figure 6-17
CLKX
—
5
0
0
5
PAREN
and
—
4
0
0
4
Figure
NOSEC
HPPUE
3
1
3
1
6-18.
NOCOP
GPPUE
—
2
1
2
Internal Pullup Resistors
Parallel Input/Output
ROMON
FPPUE
—
1
1
1
Technical Data
BPPUE
EEON
Bit 0
Bit 0
—
1
147