MC9S08RD32DWER Freescale Semiconductor, MC9S08RD32DWER Datasheet - Page 125

• Manufacturer Part Number: MC9S08RD32DWER
• Description: IC MCU 8BIT 32K FLASH 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HCS08r

Specifications of MC9S08RD32DWER

• Core Processor: HCS08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SOIC (0.300", 7.50mm Width)
• Processor Series: S08RD
• Core: HCS08
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: SCI1, SPI1
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 39
• Number Of Timers: 2
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWS08
• Development Tools By Supplier: DEMO9S08RG60E
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

9.2
Figure 9-2
The KBI module allows up to eight pins to act as additional interrupt sources. Four of these pins allow
falling-edge sensing while the other four can be configured for either rising-edge sensing or falling-edge
sensing. The sensing mode for all eight pins can also be modified to detect edges and levels instead of only
edges.
9.3
This on-chip peripheral module is called a keyboard interrupt (KBI) module because originally it was
designed to simplify the connection and use of row-column matrices of keyboard switches. However, these
inputs are also useful as extra external interrupt inputs and as an external means of waking up the MCU
from stop or wait low-power modes.
9.3.1
The KBIPEn control bits in the KBIxPE register allow a user to enable (KBIPEn = 1) any combination of
KBI-related port pins to be connected to the KBI module. Pins corresponding to 0s in KBIxPE are
general-purpose I/O pins that are not associated with the KBI module.
9.3.2
Synchronous logic is used to detect edges. Prior to detecting an edge, enabled keyboard inputs in a KBI
module must be at the deasserted logic level.
A falling edge is detected when an enabled keyboard input signal is seen as a logic 1 (the deasserted level)
during one bus cycle and then a logic 0 (the asserted level) during the next cycle.
Freescale Semiconductor
KBIxP0
KBIxP3
KBIxP4
KBIxPn
KBEDG4
KBEDGn
KBI Block Diagram
Keyboard Interrupt (KBI) Module
0
1
0
1
shows the block diagram for a KBI module.
S
S
Pin Enables
Edge and Level Sensitivity
KBIPE0
KBIPE3
KBIPEn
KBIPE4
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Figure 9-2. KBI Block Diagram
KBIMOD
V
DD
D
CK
CLR
Q
INTERRUPT FF
KEYBOARD
KBACK
RESET
Keyboard Interrupt (KBI) Block Description
STOP
SYNCHRONIZER
BUSCLK
STOP BYPASS
KBIE
KBF
KEYBOARD
INTERRUPT
REQUEST
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