mc68hc711k4 Freescale Semiconductor, Inc, mc68hc711k4 Datasheet - Page 41

• Manufacturer Part Number: mc68hc711k4
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

2.10 V
2.11 Port Signals
M68HC11K Family
MOTOROLA
RH
and V
RL
The MODB pin is grounded to select special modes, and has no function
after reset. To select the normal operating modes (single-chip and
expanded) the MODB pin is pulled to a logic high level. Connecting
MODB to a voltage source other than V
battery backup input, V
threshold (about 0.7 volts) below the voltage at V
and part of the reset logic are powered from V
Reset must be driven low before V
until V
to utilize V
significant amount of external circuitry operates from V
shows a suggested circuit employing the V
These pins provide the reference voltage for the analog-to-digital
converter.
The K series contains 62 input/output lines arranged in eight ports, A
through H; all ports are eight bits except port D, which is six bits. The KS
series drops seven lines from port G and four from port H, for a total of
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DD
has been restored to a valid level. The extra hardware required
STBY
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4.8 V
NICD
may be justified in certain applications where a
Figure 2-9. MODB/V
V
Pin Description
DD
+
STBY.
V
V
BATT
DD
MAX
690
When V
V Out
DD
DD
STBY
is removed and must remain low
4.7 K
DD
drops more than one MOS
enables it to function as a
STBY
Connection
STBY
TO MODB/ V
OF M68HC11
pin.
STBY
rather than V
, the MCU’s RAM
DD
STBY
.
Figure 2-9
Pin Description
Technical Data
VRH and VRL
DD
.
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