7721 datasheet(575/577 Pages) RENESAS

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GLOSSARY

7721 Group User’s Manual

This section briefly explains the terms used in this user’s manual. The terms defined here apply to this

manual only.

Term

Access

Access space

Access characteristics

Branch

Bus control signal

Countdown

Count source

Countup

External area

External bus

External device

Internal area

Interrupt routine

Overflow

Read-modify-write

instruction

Signal required for access

to external device

Stop mode

UART

Underflow

Wait mode

Meaning

Means performing read, write, or read and write.

In DRAMC, also means performing DRAM refresh.

An accessible memory space of up to 16 Mbytes.

Means whether accessible or not.

Means moving the program’s execution point (= address) to another location.

____

_____

A generic name for ALE, E, R/W, BLE, BHE, RDY, HOLD, HLDA,

BYTE, ST0, and ST1 signals.

Means decreasing by 1 and counting.

A signal that is counted by timers A and B, the UARTi baud rate

selected by the count source select bits and others.

Means increasing by 1 and counting.

An accessible area for external devices connected. It is up to 16-

Mbyte external area.

A generic name for the external address bus and the external

data bus.

Devices connected externally to the microcomputer. A generic

name for a memory, an I/O device and a peripheral IC.

An accessible internal area. A generic name for areas of the

internal RAM and the SFR.

A routine that is automatically executed when an interrupt request

is accepted. Set the start address of this routine into the interrupt

vector table.

A state where the countup resultant is greater than the counter

resolution.

An instruction that reads the memory contents, modifies them

and writes back to the same address. Relevant instructions are

the ASL, ASR, CLB, DEC, INC, LSR, ROL, ROR, SEB instructions.

A generic name for bus control, address bus, and data bus signals.

A state where the oscillation circuit halts and the program execution

is stopped. By executing the STP instruction, the microcomputer

enters the stop mode.

Clock asynchronous serial I/O. When used to designate the name

of a functional block, this term also means the serial I/O which

can be switched to the cock synchronous serial I/O.

A state where the countdown resultant is greater than the counter

resolution.

A state where the oscillation circuit is operating, however, the

program execution is stopped. By executing the WIT instruction,

the microcomputer enters the wait mode.

Relevant term

Access

Countup

Countdown

Internal area

External area

Underflow

Countup

Bus

control

signal

Wait mode

Clock

synchronous

serial I/O

Overflow

Countdown

Stop mode

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