3-4
MSM66591/ML66592 User's Manual
Chapter 3 CPU Architecture
[1]
Accessing Program Memory Space
Program memory space is usually accessed by the program counter (PC) and the code
segment register (CSR). However, when a ROM table reference instruction
(LC A, obj...etc.) or a ROM window function (see Section 5.1) is executed, program
memory space is accessed by the content of the table segment register (TSR) and the
register specified by the instruction.
Accessing the internal ROM area and the external memory (ROM) area of the program
memory space is automatically switched by an internal MSM66591/ML66592 operation
by the status of the
EA
pin (input: pin 3).
When "H" level is input to the
EA
pin, the internal program memory area is accessed for
the entire program address. When "L" level is input to the
EA
pin, the external program
memory area is accessed for the entire program address.
If the external memory area of the program memory space is accessed with the
EA
pin
in "L" level, Port 0 (I/O: pins 72–79: output of low address and input of data), Port 1
(output: pins 82–89: output of high address) and P12_0/A16 pin (output: pin 90: output
of code segment) operates as the bus port, and the P7_3/
PSEN
pin (output: pin 56)
becomes active synchronizing with the P7_2/ALE pin (output: pin 55). In ML66592,
P12_1/A17 (output: pin 91: output of code segment) also operates as a bus port.
In MSM66591, the internal program fetch enable area is 00000H–1FFFDH. This means
that the final address of instruction code must not exceed 1FFFDH. The final address of
the table data is 1FFFFH.
In ML66592, the internal program fetch enable area is 00000H–2FFFDH. This means
that the final address of instruction code must not exceed 2FFFDH. The final address of
the table data is 2FFFFH.
Segment 3 is not provided in the ML66592. Therefore, do not access address 30000H
or later.
[2]
Vector Table Area
The 74-byte area and 12-byte area of program memory space, which are 0000H–0049H
and 006AH–0074H in segment 0 respectively, are the vector table area (43 types). This
program memory space is used to store branch addresses caused by reset by
RES
(input:
pin 2) input, reset by execution of BRK instruction, reset by watchdog timer (WDT) overflow,
and reset by an operation code trap (OPTRP). It is also used to store branch addresses by
various interrupt requests.
If a reset or interrupt occurs, a 2-byte content of a branch address, stored in the corre-
sponding vector table, is loaded to the PC (an even address is insignificant data, the
following odd address is significant data), while at the same time "0" is loaded to the
CSR, and program execution starts from the loaded address in segment 0. Therefore, if
the reset or interrupt occurs during execution of the instruction for segment 1, the
program is executed from an address in segment 0.
If this area is not used as a vector table area, it can be used as a normal program area.
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Страница 112: ...Memory Control Functions Chapter 5 5...
Страница 113: ......
Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
Страница 153: ......
Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Страница 156: ...Clock Generation Circuit Chapter 8 8...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10...
Страница 165: ......
Страница 170: ...Flexible Timer FTM Chapter 11 11 11...
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Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
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Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Страница 224: ...PWM Functions Chapter 13 13...
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Страница 244: ...Baud Rate Generator Functions Chapter 14 14...
Страница 245: ......
Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Страница 264: ...Serial Port Functions Chapter 15 15...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Страница 382: ...Transition Detector Functions Chapter 17 17...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Страница 388: ...Peripheral Functions Chapter 18 18...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20...
Страница 397: ......
Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Страница 408: ...Bus Port Functions Chapter 21 21...
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Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Страница 414: ...Expansion Port Chapter 22 22...
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Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
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Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Страница 432: ...RAM Monitor Function Chapter 24 24...
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Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Страница 442: ...25 Electrical Characteristics Chapter 25...
Страница 443: ......
Страница 458: ...Package Dimensions Chapter 26 26...
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Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Страница 462: ...Revision History Chapter 27 27...
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Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...