 |
|
|
MESC TOOL NEWS:
MESCT-M16C/62POD-981201D
M30620T-RPD-E, M30620TB-RPD-E,
M30620T-RPD, M30620TB-RPD
Precautions
(Related to Interrupts)
|
|---|
Please take note of the problem related to interrupts in using emulation pods M30620T-RPD-E, M30620TB-RPD-E, M30620T-RPD, and M30620TB-RPD for the M16C/62 series of microcomputers.
Problem
When two interrupts are requested at (approximately) the same time, one of the two interrupts may not be generated, and the other or the third interrupt that is not requested may erroneously be generated instead. This problem depends on the operating voltage and frequency.
[Example]: When timer interrupts TB5 and TB2 are requested at (approximately) the same time:
Normal operation: TB5 and TB2 occur once each.
Abnormal operation 1: Two TB2s occur successively (the first of them is generated erroneously where TB5 ought to occur).
Abnormal operation 2: INT3 and TB2 occur (INT3 is generated erroneously where TB5 ought to occur).
Note: This problem does not occur in usual MCU-based systems; it happens only when emulation pods are used.
Products Concerned
The type names and serial numbers of the emulation pods concerned are listed in Table 1 below.
Table 1. List of Emulation Pods Concerned
| Type Name | Serial No. | Example of Serial No. |
| M30620T-RPD-E | A number placed at the end
A or B placed at the end | 8DS012
8FS123A |
| M30620TB-RPD-E | A number placed at the end
A, B, C, or D placed at the end | 8ES234
8GS345D |
M30620T-RPD
(Dropped from production) | A number placed at the end
A or B placed at the end | 8CS111
8DS222A |
M30620TB-RPD
(Dropped from production) | A number placed at the end
A, B, C, or D placed at the end | 8CS333
8DS444D |
Note: Products shipped as TS (Technical Samples) and ES (Engineering Samples) are excluded from replacement described later.
Operating Conditions Concerned
Tables 2 and 3 show the operating voltages and frequencies at which this problem occurs. The number of wait states (including zero wait states) is independent of the problem.
Note that, however, the conditions shown in the tables below may somewhat vary with the duty cycle of the oscillator module, ambient temperature, the individuality of the emulation pod.
Table 2. Operating Conditions under Which Problem Occurs (M30620T-RPD-E, M30620T-RPD)
| No frequency division | Operating voltage [V] | 2.7 | 3.0 | 3.3 | 3.6 | 3.9 | 4.2 | 4.5 | 5.0 |
| Operating frequency [MHz] | 7.9
or more | 9.3
or more | 10.4
or more | 11.3
or more | 12.0
or more | 12.6
or more | 13.1
or more | 13.7
or more |
Divided-by-2, Divided-by-4,
Divided-by-8, Divided-by-16 | The problem will not occur. |
Table 3. Operating Conditions under Which Problem Occurs (M30620TB-RPD-E, M30620TB-RPD)
| No frequency division | Operating frequency [MHz] | 14.2 or more |
Divided-by-2, Divided-by-4,
Divided-by-8, Divided-by-16 | The problem will not occur. |
Solution
Replacing the M30620T-RPDM board mounted in your emulation pod with a new M30620T-PRTM board will eliminate this problem.
- How to obtain new M30620T-PRTM board
- [Application Effective]
- From December 1, 1998
- [Action]
- Fill in "Application Form for M30620T-PRTM Board" and send it to your local Renesas Technology sales office or distributor via fax
Please ensure the serial number is attached in the application form. The serial number is inscribed at the back of your product.
- How to replace your M30620T-RPDM board with a new M30620T-PRTM board
On receipt of your application, we will deliver a new M30620T-PRTM board, one product per application. Then, please replace your current board with the new one following the procedure described in "Board Replacement Instruction Manual" included with the board delivered.
Notes
- This problem does not occur in usual MCU-based systems; it happens only when emulation pods are used.
- Your current product need not be sent back to us.
- One new board per product is available for replacement.
Application Form for M30620T-PRTM Board
Please print out the application form from HERE and use it.
|
|
