MC68HC912BD32 Datasheet, PDF (35/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Pinout and Signal Descriptions
Port Pull-Up, Pull-Down and Reduced Drive
Table 7 MC68HC912BD32 Port Description Summary
Port
Name
Port SBI
DIVBYP
PSBI[5:2]
TxSBI
RxSBI
Pin
Numbers
70–76
Port E
PE[7:0]
26–29,
35–38
Port P
PP[7:0]
Port S
PS[7:0]
79, 80, 1–6
68–61
Port T
PT[7:0]
16–12, 9–7
Data Direction
DD Register
(Address)
In/Out
DDRSBI ($0112)
for PSBI[5:2]
TxSBI Out
RxSBI, DIVBYP In
PE[1:0] In
PE[7:2] In/Out
DDRE ($0009)
In/Out
DDRP ($0057)
In/Out
DDRS ($00D7)
In/Out
DDRT ($00AF)
Description
Byteflight™ subsystem with Tx output, Rx and divider bypass
input and general-purpose I/O on
PSBI[5:2].
Mode selection, bus control signals and interrupt service
request signals; or general-purpose I/O.
General-purpose I/O. PP[3:0] are use with the pulse-width
modulator when enabled.
Serial communications interface and serial peripheral
interface subsystems and general-purpose I/O.
General-purpose I/O when not enabled for input capture and
output compare in the timer and pulse accumulator
subsystem.
Port Pull-Up, Pull-Down and Reduced Drive
MCU ports can be configured for internal pull-up. To reduce power
consumption and RFI, the pin output drivers can be configured to
operate at a reduced drive level. Reduced drive causes a slight increase
in transition time depending on loading and should be used only for ports
which have a light loading. Table 8 summarizes the port pull-up default
status and controls.
Table 8 Port Pull-Up, Pull-Down and Reduced Drive Summary
Port
Name
Port A
Port B
Port E:
PE7, PE[3:0]
PE[6:4]
PE[6:5]
Resistive
Input
Loads
Pull-up
Pull-up
Pull-up
None
Pull-down
Enable Bit
Register
(Address)
Bit
Name
PUCR ($000C)
PUCR ($000C)
PUPA
PUPB
Reset
State
Disabled
Disabled
PUCR ($000C) PUPE Enabled
—
Enabled During Reset
Reduced Drive Control Bit
Register
(Address)
Bit
Name
Reset
State
RDRIV ($000D)
RDRIV ($000D)
RDPA Full Drive
RDPB Full Drive
RDRIV ($000D)
RDRIV ($000D)
—
RDPE
RDPE
—
Full Drive
Full Drive
—
15-pins
Pinout and Signal Descriptions
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MC68HC912BD32 Rev 1.0