The MC9S08QA4 series are members of the cost-effective, high-performance S08 family of 8-bit microcontroller units featuring 1.8 to 3.3-volt operation, on-chip memory, two very low-power stop modes and low-voltage detection with reset or interrupt. The S08 core delivers a 40 MHz core speed and 20 MHz bus speed.
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## Features
### 8-bit HCS08 Central Processor Unit (CPU)
* Up to 20 MHz HCS08 CPU (10 MHz bus frequency) for 100 ns minimum instruction time
* HC08 instruction set with added BGND instruction
* Support for up to 32 interrupt/reset sources
### Integrated Third-Generation Flash Memory and RAM
* Embedded flash that is in-application reprogrammable over the full operating voltage and temperature range with a single power supply
* Extremely fast, byte-writable programming; as fast as 20 us/byte
* Up to 100,000 write/erase cycles at typical voltage and temperature (10k minimum write/erase)
* 100 years typical data retention (15 years minimum)
### Flexible Clock Options
* Internal clock source (ICS) module containing a frequency-locked loop (FLL) controlled by internal or external reference
* Precision trimming of internal reference allows typical 0.1 percent resolution and +0.5 percent to -1 percent deviation over operating temperature and voltage
* Internal reference can be trimmed from 31.25 kHz to 39.065 kHz, allowing for 8 MHz to 10 MHz FLL output
### Input/Output (I/O) Lines
* 4 Bidirectional Input/Output (I/O) Lines
* One Input Only and One Output Only Line
* Outputs 10 mA each, 60 mA max for package
* Software selectable pull-ups on ports when used as input
* internal pull-up on reset
* interrupt request (IRQ) pin
* Software selectable slew rate control and drive strength on ports when used as output
* 4-pin keyboard interrupt module with software selectable polarity on edge or edge/level modes
### Integrated Analog Peripherals
* 4-ch., 10-bit analog-to-digital converter (ADC)
* Automatic compare function, software programmable for greater than/equal to or less than conditions
* Asynchronous clock source
* Temperature sensor
* Internal bandgap reference channel
* Hardware triggerable using the RTI counter
* Low-power and high-speed options
### Analog comparator module (ACMP)
* Option to compare to internal reference
* Option to route comparator output directly to pin
* Output can be optionally routed to TPM module as Input capture trigger
### Two Timer Modules
* Programmable 16-bit timer/PWM module (TPM)
* 8-bit modulo timer module (MTIM) with 8-bit prescaler
### System Protection
* Watchdog computer operating properly (COP) reset with option to run from dedicated 1 kHz internal clock source or bus clock
