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<<O>> Difference Topic 82C55 (r1.3 - 01 Aug 2005 - Home.blundar)

Changed:

<
<

IC13

2=control

PC1 -> ??

>
>

IC13

2=control

PC1 -> IC13 / pre-vtec control

Changed:

<
<

7U016

PB0 -> ??

>
>

7U016

PB0 -> 7U016

Changed:

<
<

O	23	IC15	2=control	PB4 -> ??
O	24	Q17	1=control	PB5 -> aib/shift light control

>
>

O	23	IC15	2=control	PB4 -> IC15 / Auto trans lockup solenoid A
O	24	Q17	1=control	PB5 -> aib/shift light control/q34 auto lockup

Changed:

<
<

7U016

PB7 -> ??

>
>

7U016

PB7 -> 7U016

<<O>> Difference Topic 82C55 (r1.2 - 16 Mar 2004 - Home.blundar)


Added:
> >	%META:FILEATTACHMENT{name="MSM82C55A-2RS-GS-VJS.pdf" attr="" comment="Datasheet for the Oki 82C55 as used in ECU." date="1079470176" path="C:\Documents and Settings\Administrator\Desktop\temp\MSM82C55A-2RS-GS-VJS.pdf" size="193605" user="blundar" version="1.1"}%

<<O>> Difference Topic 82C55 (r1.1 - 25 Feb 2004 - Home.blundar)

Added:

>
>

%META:TOPICINFO{author="blundar" date="1077677573" format="1.0" version="1.1"}% The 82C55 is an IO controller chip used in many OBD1 ECUs.

Fortunately, almost all OBD1 Civic Integra ECUs share a common pattern for what is controlled by the 82C55 chip. Vernon (Deluded) took the time to electrically map what is connected to the 82C55 on these ECUs.

A datasheet is available here, except the 82C55 used in Honda ECUs mysteriously has two extra pins -- my guess is they're 17 and 37, both unused. The code sets the control register to 0x90, which means it uses so-called Mode 0, port A is an input, and ports B and C are outputs.

*I/O*	*82C55 pin*	*element*	*element pin*	*function*
I	1	A/D board		PA3 <- tps/vss diagnostic?
I	2	R114		PA2 <- (paired with R109?)
I	3	R113		PA1 <- (paired with R110?)
I	4	R112		PA0 <- (paired with R111?)
	5	66207	24	/RD signal, both 82C55 and 66207
	6	66207	15	82C55 /CS <- 66207 A14
	7	gnd		Vss
	8	66207	14	82C55 A1 <- 66207 A13
	9	66207	12	82C55 A0 <- 66207 A12 ''(shouldn't that be pin 13?)''
O	10	knock resistors		PC7 -> knock diagnostic?
O	11	Q16	1=control	PC6 -> ultimately controls EGR sol
O	12	R134		PC5 -> 10Kohm pull-up resistor
O	13	Q46	1=control	PC4 -> ultimately controls MIL
O	14	IC14	2=control	PC0 -> VTEC sol control
O	15	IC13	2=control	PC1 -> ??
O	16	Q12	1=control	PC2 -> ultimately controls O2 Heater
	17	unused
O	18	knock resistors		PC3 -> knock diagnostic?
O	19	7U016	3	PB0 -> ??
O	20	Q14	1=control	PB1 -> ultimately controls purge sol
O	21	Q37	1=control	PB2 -> ultimately controls alternator
O	22	Q13	1=control	PB3 -> ultimately controls rad fan
O	23	IC15	2=control	PB4 -> ??
O	24	Q17	1=control	PB5 -> aib/shift light control
O	25	RM13	8	PB6 -> 10kohm resistor: pull up
O	26	7U016	10	PB7 -> ??
	27	5V		Vcc
	28	66207	8	D7
	29	66207	7	D6
	30	66207	6	D5
	31	66207	5	D4
	32	66207	4	D3
	33	66207	3	D2
	34	66207	2	D1
	35	66207	1	D0
	36	7U016	39	RESET?
	37	unused
	38	RM13	9	10kohm resistor: pull up - WR also?
I	39	A/D board		PA7 <- tps/vss diagnostic?
I	40	Q30	2=o/p	PA6 <- diag for O2 heater
I	41	Q26/101	2=o/p	PA5 <- diag for IC14=Vtec sol 1720,1980/11F0
I	42	Q28	2=o/p	PA4 <- diag for IC15

Notes: intake resonator control doubles up: IC16(3) to Q27(2) to IC9(6)

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Revision r1.1 - 25 Feb 2004 - 02:52 GMT - Home.blundar
Revision r1.3 - 01 Aug 2005 - 14:37 GMT - Home.blundar