MC68HC908QY1VDTE Freescale Semiconductor, MC68HC908QY1VDTE Datasheet - Page 105
Manufacturer Part Number
IC MCU 1.5K FLASH 16-TSSOP
Specifications of MC68HC908QY1VDTE
LVD, POR, PWM
Number Of I /o
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
-40°C ~ 105°C
Package / Case
Data Bus Width
Data Ram Size
Maximum Clock Frequency
Number Of Programmable I/os
Number Of Timers
Maximum Operating Temperature
+ 105 C
Development Tools By Supplier
FSICEBASE, M68CBL05AE, DEMO908QB8, DEMO908QC16
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / Rohs Status
13.3.1 Bus Timing
In user mode, the internal bus frequency is the oscillator frequency (BUSCLKX4) divided by four.
13.3.2 Clock Start-Up from POR
When the power-on reset module generates a reset, the clocks to the CPU and peripherals are inactive
and held in an inactive phase until after the 4096 BUSCLKX4 cycle POR time out has completed. The
IBUS clocks start upon completion of the time out.
13.3.3 Clocks in Stop Mode and Wait Mode
Upon exit from stop mode by an interrupt or reset, the SIM allows BUSCLKX4 to clock the SIM counter.
The CPU and peripheral clocks do not become active until after the stop delay time out. This time out is
selectable as 4096 or 32 BUSCLKX4 cycles. See
In wait mode, the CPU clocks are inactive. The SIM also produces two sets of clocks for other modules.
Refer to the wait mode subsection of each module to see if the module is active or inactive in wait mode.
Some modules can be programmed to be active in wait mode.
13.4 Reset and System Initialization
The MCU has these reset sources:
All of these resets produce the vector $FFFE–FFFF ($FEFE–FEFF in monitor mode) and assert the
internal reset signal (IRST). IRST causes all registers to be returned to their default values and all
modules to be returned to their reset states.
An internal reset clears the SIM counter (see
the resets sets a corresponding bit in the SIM reset status register (SRSR). See
Power-on reset module (POR)
External reset pin (RST)
Computer operating properly module (COP)
Low-voltage inhibit module (LVI)
MC68HC908QY/QT Family Data Sheet, Rev. 6
Figure 13-2. SIM Clock Signals
Counter), but an external reset does not. Each of
Reset and System Initialization