
M68HC16 Z SERIES
OVERVIEW
MOTOROLA
USER’S MANUAL
3-1
SECTION 3
OVERVIEW
This section provides general information on M68HC16 Z-series MCUs. It lists fea-
tures of each of the modules, shows device functional divisions and pin assignments,
summarizes signal and pin functions, discusses the intermodule bus, and provides
system memory maps. Timing and electrical specifications for the entire microcontrol-
TERISTICS. Comprehensive module register descriptions and memory maps are
3.1 M68HC16 Z-Series MCU Features
The following paragraphs highlight capabilities of each of the MCU modules. Each
module is discussed separately in a subsequent section of this manual.
3.1.1 Central Processor Unit (CPU16/CPU16L)
16-bit architecture
Full set of 16-bit instructions
Three 16-bit index registers
Two 16-bit accumulators
Control-oriented digital signal processing capability
Addresses up to 1 Mbyte of program memory; 1 Mbyte of data memory
Background debug mode
Fully static operation
Expanded LPSTOP operation on CPU16L (MC68HC16Z4, MC68CK16Z4 only)
3.1.2 System Integration Module (SIM/SIML)
External bus support
Programmable chip-select outputs
System protection logic
Watchdog timer, clock monitor, and bus monitor
Two 8-bit dual function input/output ports
One 7-bit dual function output port
Phase-locked loop (PLL) clock system
Expanded LPSTOP operation on SIML (MC68HC16Z4, MC68CK16Z4 only)
3.1.3 Standby RAM (SRAM)
1-Kbyte static RAM (MC68HC16Z1/Z4 only)
2-Kbyte static RAM (MC68HC16Z2 only)
4-Kbyte static RAM (MC68HC16Z3 only)
External standby voltage supply input