NEC MuPD754144 Datasheet

Contents

NEC MuPD754144 Datasheet Manual pdf 19 page image

μPD754144, 75424419Data Sheet U10040EJ2V1DS7. PERIPHERAL HARDWARE FUNCTIONS7.1 Digital Input/Output PortsThe following two types of I/O ports are provided.• CMOS input (Port 7) : 4• CMOS I/O (Ports 3, 6, 8) : 9Total : 13Table 7-1. Types and Features of Digital PortsPort Name Function Operation and Features RemarksPORT3 4-bit I/O Can be set to input or output mode bit-wise. Also used as PTO0 to PTO2 pins.PORT6 Also used as AV REF , INT0, PTH00,and PTH01 pins.PORT7 4-bit input 4-bit input only port Also used as KR4 to KR7 pins.On-chip pull-up resistor connection can be specifiedby mask option bit-wise.PORT8 1-bit I/O Can be set to input or output mode bit wise. _7.2 Clock GeneratorThe clock generator provides the clock signals to the CPU and peripheral hardware. Its configuration is shownin Figures 7-1 and 7-2.The operation of the clock generator is set with the processor clock control register (PCC).The instruction execution time can be changed.•μPD754144• 4, 8, 16, 64 μs (when the system clock f CC operates at 1.0 MHz)•μPD754244• 0.95, 1.91, 3.81, 15.3 μs (when the system clock f X operates at 4.19 MHz)• 0.67, 1.33, 2.67, 10.7 μs (when the system clock f X operates at 6.0 MHz)*