MC68HC908QY1MDW Freescale Semiconductor, MC68HC908QY1MDW Datasheet - Page 90

• Manufacturer Part Number: MC68HC908QY1MDW
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908QY1MDW

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 1.5 KB
• Data Ram Size: 128 B
• On-chip Adc: No
• Operating Supply Voltage: 3.3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOIC-16
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 13
• Number Of Timers: 2
• Program Memory Type: Flash
• Factory Pack Quantity: 47
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Oscillator Module (OSC)
11.3.1 Internal Oscillator
The internal oscillator circuit is designed for use with no external components to provide a clock source
with tolerance less than ±25% untrimmed.An 8-bit trimming register allows adjustment to a tolerance of
less than ±5%.
The internal oscillator will generate a clock of 12.8 MHz typical (INTCLK) resulting in a bus speed (internal
clock ÷ 4) of 3.2 MHz. 3.2 MHz came from the maximum bus speed guaranteed at 3 V which is 4
MHz.Since the internal oscillator will have a ±25% tolerance (pre-trim), then the +25% case should not
allow a frequency higher than 4 MHz:
Figure 11-3
BUSCLKX4 by setting OSC2EN in PTAPUE register. See
90
3.2 MHz + 25% = 4 MHz
RST, IRQ: Pins have internal (about 30K Ohms) pull up
PTA[0:5]: High current sink and source capability
PTA[0:5]: Pins have programmable keyboard interrupt and pull up
PTB[0:7]: Not available on 8-pin devices – MC68HC908QT1, MC68HC908QT2, and MC68HC908QT4 (see note in
12.1
ADC: Not available on the MC68HC908QY1 and MC68HC908QT1
PTA4/OSC2/AD2/KBI4
PTA5/OSC1/AD3/KBI5
PTA0/AD0/TCH0/KBI0
PTA1/AD1/TCH1/KBI1
PTA2/IRQ/KBI2/TCLK
Introduction)
PTA3/RST/KBI3
shows how BUSCLKX4 is derived from INTCLK and, like the RC oscillator, OSC2 can output
POWER SUPPLY
PTB0
PTB1
PTB2
PTB3
PTB4
PTB5
PTB6
PTB7
Figure 11-1. Block Diagram Highlighting OSC Block and Pins
128 BYTES RAM
8-BIT ADC
V
V
DD
SS
MC68HC908QY/QT Family Data Sheet, Rev. 6
MC68HC908QT2, AND MC68HC908QT1:
MC68HC908QY4 AND MC68HC908QT4
MC68HC908QY2, MC68HC908QY1,
M68HC08 CPU
USER FLASH
4096 BYTES
1536 BYTES
Chapter 12 Input/Output Ports (PORTS)
KEYBOARD INTERRUPT
SYSTEM INTEGRATION
SINGLE INTERRUPT
POWER-ON RESET
MONITOR ROM
(OSCILLATOR)
Freescale Semiconductor
GENERATOR
16-BIT TIMER
MODULE
MODULE
MODULE
MODULE
MODULE
MODULE
MODULE
CLOCK
BREAK
COP