Overview Of The Program Loader Mode - Fujitsu FR60 Hardware Manual

CHAPTER 19 PROGRAM LOADER MODE (SUPPORTED ONLY BY THE MB91302A (IPL INTEGRATED MODEL))

19.1 Overview of the Program Loader Mode

This section gives an overview of the program loader mode.
■ Overview of the Program Loader Mode
In the program loader mode, the program loader stored in the internal ROM uses UART ch.0 to
perform serial communication with an external device, load a program from the external device
to the internal RAM (2 Kbytes), and to start the loaded program.
For serial communication, asynchronous or synchronous communication can be selected
depending on the state of the SIN0 pin of UART ch.0 upon initialization by INIT. For
asynchronous communication, however, the oscillation frequency is 17.0 MHz (quadrupled by
the PLL to 68.0 MHz as the CPU's operating clock frequency). For asynchronous
communication, be sure to use the device at an oscillation frequency of 17.0 MHz as it operates
at a baud rate of 9600 bps.)
Note that the program loader mode is supported only by the MB91302A (IPL integrated model).
■ Memory Map
The loader program stored in the internal ROM (4K bytes) is executed in the internal-ROM/
external-bus mode, resulting in a memory map as shown below. Programs can be located in the
following instruction RAM area (instruction cache set for RAM mode). To access, for example,
an external area, use the downloaded program to make the required register settings.
000FFFFF
000FF000
0003FFFF
0003F000
000187FF
00018000
00000000
498
H
Internal ROM (4Kbytes)
H
H
RAM area (4Kbytes)
H
H
RAM area (2Kbytes)
H
H
Data RAM
Instruction RAM