mc68hc05l25 Freescale Semiconductor, Inc, mc68hc05l25 Datasheet - Page 72

• Manufacturer Part Number: mc68hc05l25
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (I/O)
7.5.4 I/O Pin Transitions
A glitch can be generated on an I/O pin when changing it from an input to an output unless the data
register is first pre-conditioned to the desired state before changing the corresponding DDR bit from a
zero to a one.
7.5.5 I/O Pins with Subsystems
An I/O pin that is shared with another subsystem is in general configured as an input pin during reset,
except for LCD driver pins. The LCD driver output pins BP0:BP3 and FP0:FP24 are configured to output
V
72
DD
Port
A
B
C
1. Pullup resistor resistances are typical values with V
2. Port C bits 2 and 3 are open-drain outputs and do not have CMOS drive capability.
level during and after reset. See truth tables of each I/O port for more details.
Bit
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
DDRA0
DDRA1
DDRA2
DDRA3
DDRA4
DDRA5
DDRA6
DDRA7
DDRB0
DDRB1
DDRB2
DDRB3
DDRB4
DDRB5
DDRB6
DDRB7
DDRC0
DDRC1
DDRC2
DDRC3
DDR
BWOMH
BWOML
CWOM
AWOM
WOM
Table 7-13. Port Control Register Bits Summary
1
1
1
1
1
1
Pullup R
RAH
RBH
RAL
RBL
MC68HC05L25 Data Sheet, Rev. 3.1
RC
DD
= 3 V. See
ADON, EVCE
LCDE, PBEH
BZPE, KWIE
LCDE, PBEL
ADON
KWIE
IRQE
RME
SPE
—
Chapter 15 Electrical Specifications
Module Control
TBCLK, RMC4:RMC0
CH2:CH0/EVxx
F24B3:F24B0
F23B3:F23B0
F22B3:F22B0
F21B3:F21B0
F20B3:F20B0
F19B3:F19B0
F18B3:F18B0
F17B3:F17B0
BZxx, KWIE3
MSTR, SPR
DORD, SPR
CH2:CH0
KWIE0
KWIE1
KWIE2
IRQS
—
for more details.
Freescale Semiconductor
KWI3/BZ
AD0/EVI
Module
KWI0
KWI1
KWI2
RMO
FP24
FP23
FP22
FP21
FP20
FP19
FP18
FP17
SDO
SCK
AD1
IRQ
SDI
—