MC68HC908QY1VDTE Freescale Semiconductor, MC68HC908QY1VDTE Datasheet - Page 81

IC MCU 1.5K FLASH 16-TSSOP

MC68HC908QY1VDTE

Manufacturer Part Number
MC68HC908QY1VDTE
Description
IC MCU 1.5K FLASH 16-TSSOP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68HC908QY1VDTE

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
13
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 105°C
Package / Case
16-TSSOP
Processor Series
HC08Q
Core
HC08
Data Bus Width
8 bit
Data Ram Size
128 B
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
14
Number Of Timers
2
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Development Tools By Supplier
FSICEBASE, M68CBL05AE, DEMO908QB8, DEMO908QC16
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
Lead Free Status / Rohs Status
 Details
KBI0
.
.
KBIE0
TO PULLUP ENABLE
.
KBI5
KBIE5
TO PULLUP ENABLE
(1)
AWUIREQ
1. For AWUGEN logic refer to
Figure 9-2. Keyboard Interrupt Block Diagram
If the MODEK bit is set, the keyboard interrupt inputs are both falling edge and low-level sensitive, and
both of the following actions must occur to clear a keyboard interrupt request:
Vector fetch or software clear — A vector fetch generates an interrupt acknowledge signal to clear
the interrupt request. Software may generate the interrupt acknowledge signal by writing a 1 to the
ACKK bit in the keyboard status and control register (KBSCR). The ACKK bit is useful in
applications that poll the keyboard interrupt inputs and require software to clear the keyboard
interrupt request. Writing to the ACKK bit prior to leaving an interrupt service routine can also
prevent spurious interrupts due to noise. Setting ACKK does not affect subsequent transitions on
the keyboard interrupt inputs. A falling edge that occurs after writing to the ACKK bit latches
another interrupt request. If the keyboard interrupt mask bit, IMASKK, is clear, the central
processor unit (CPU) loads the program counter with the vector address at locations $FFE0 and
$FFE1.
Return of all enabled keyboard interrupt inputs to logic 1 — As long as any enabled keyboard
interrupt pin is at logic 0, the keyboard interrupt remains set. The auto wakeup interrupt input,
AWUIREQ, will be cleared only by writing to ACKK bit in KBSCR or reset.
The vector fetch or software clear and the return of all enabled keyboard interrupt pins to logic 1 may occur
in any order.
If the MODEK bit is clear, the keyboard interrupt pin is falling-edge sensitive only. With MODEK clear, a
vector fetch or software clear immediately clears the keyboard interrupt request.
Reset clears the keyboard interrupt request and the MODEK bit, clearing the interrupt request even if a
keyboard interrupt input stays at logic 0.
The keyboard flag bit (KEYF) in the keyboard status and control register can be used to see if a pending
interrupt exists. The KEYF bit is not affected by the keyboard interrupt mask bit (IMASKK) which makes
it useful in applications where polling is preferred.
Freescale Semiconductor
V
DD
CLR
D
Q
CK
KEYBOARD
INTERRUPT FF
MODEK
Figure 4-1. Auto Wakeup Interrupt Request Generation
MC68HC908QY/QT Family Data Sheet, Rev. 6
Functional Description
INTERNAL BUS
VECTOR FETCH
DECODER
ACKK
RESET
KEYF
SYNCHRONIZER
IMASKK
Logic.
KEYBOARD
INTERRUPT
REQUEST
81

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