EM6605 EM Microelectronic, EM6605 Datasheet - Page 27

• Manufacturer Part Number: EM6605
• Description: 4 bit Microcontroller
• Manufacturer: EM Microelectronic

12. STroBe / RESet Output
The STB/RST output pin is used to indicate the EM6605 RESET condition as well as write operations to ports B, C
and D. For a PortB, PortC and PortD write operation the STROBE signal goes high for half of the system clock
period. Write is effected on falling edge of the strobe signal and it can this be used to indicate when data changes
at the output port pins. In addition, any EM6605 internal RESET condition is indicated by a continuous high level on
STB/RES for the period of the RESET.
13. Test at EM - Active Supply Current test
For this purpose, five instructions at the end of the ROM will be added.
TESTLOOP :
14. Metal Mask Options
The following options can be selected at the time of programming the metal mask ROM.
Table 42 buzzer frequecies
ck[buz1]
ck[buz2]
Put one cross in each line
description
1st buzzer frequency
2nd buzzer frequency
;RESET WATCHDOG HERE
STI
STI
LDR
LDR
JMP
00H,
75H
00A
75H
TESTLOOP
05H
0AH
;TEST LOOP
basic (hi)
© EM Microelectonic-Marin SA, 2/99, Rev. B/243
reduced (lo)
EM6605
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