MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 240

• Manufacturer Part Number: MC908AZ32ACFU
• Description: IC MCU 32K FLASH 8.4MHZ 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908AZ32ACFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: CAN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 40
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 15x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Keyboard Module (KBD)
22.5.2 Stop Mode
The keyboard module remains active in stop mode. Clearing the IMASKK bit in the keyboard status and
control register enables keyboard interrupt requests to bring the MCU out of stop mode.
22.6 Keyboard Module During Break Interrupts
The BCFE bit in the break flag control register (BFCR) enables software to clear status bits during the
break state. See
To allow software to clear the KEYF bit during a break interrupt, write a logic 1 to the BCFE bit. If KEYF
is cleared during the break state, it remains cleared when the MCU exits the break state.
To protect the KEYF bit during the break state, write a logic 0 to the BCFE bit. With BCFE at logic 0, writing
to the keyboard acknowledge bit (ACKK) in the keyboard status and control register during the break state
has no effect. See
22.7 I/O Registers
The following registers control and monitor operation of the keyboard module:
22.7.1 Keyboard Status and Control Register
The keyboard status and control register:
Bits 7–4 — Not used
KEYF — Keyboard Flag Bit
240
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•
•
•
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These read-only bits always read as logic 0s.
This read-only bit is set when a keyboard interrupt is pending. Reset clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
Keyboard status and control register (KBSCR)
Keyboard interrupt enable register (KBIER)
Flags keyboard interrupt requests
Acknowledges keyboard interrupt requests
Masks keyboard interrupt requests
Controls keyboard interrupt triggering sensitivity
Address: $001B
Reset:
Read:
Write:
Chapter 11 Brake
22.7.1 Keyboard Status and Control
Figure 22-3. Keyboard Status and Control Register (KBSCR)
Bit 7
0
0
= Unimplemented
6
0
0
Module.
MC68HC908AZ32A Data Sheet, Rev. 2
5
0
0
4
0
0
Register.
KEYF
3
0
ACKK
2
0
0
IMASKK
1
0
Freescale Semiconductor
MODEK
Bit 0
0