CHAPTER 19 IEBus CONTROLLER (V850/SB2)
User’s Manual U13850EJ4V0UM
444
Table 19-5. Acknowledge Signal Output Condition of Control Field
(a) If received control data is AH, BH, EH, or FH
Received Control Data
Communication
Target (SLVRQ)
Slave
Specification = 1
No Specification
= 0
Lock Status
(LOCK)
Lock = 1
Unlock = 0
Master Unit
Identification
(Match with PAR)
Lock Request
Unit = 1
Other = 0
Slave
Transmission
Enable
(ENSLVTX)
Slave Reception
Enable
(ENSLVRX)
AH
BH
EH
FH
0
don’t care
1
1
1
don’t care
1
{
Other than above
×
(b) If received control data is 0H, 3H, 4H, 5H, 6H, or 7H
Received Control Data
Communication
Target (SLVRQ)
Slave
Specification = 1
No Specification
= 0
Lock Status
(LOCK)
Lock = 1
Unlock = 0
Master Unit
Identification
(Match with PAR)
Lock Request
Unit = 1
Other = 0
Slave
Transmission
Enable
(ENSLVTX)
Slave Reception
Enable
(ENSLVRX)
0H 3H 4H 5H 6H 7H
0
{
×
×
×
{
×
0
1
{ {
×
×
{ {
don’t care
{
×
{ {
×
×
don’t care
{
×
{ {
{
×
1
1
1
1
don’t care
{ { { {
{ {
Other than above
×
Caution If the received control data is other than the data shown in Table 19-5,
××××
(ACK is not returned) is
unconditionally assumed.
Remarks 1.
{
: ACK is returned.
×
: ACK is not returned.
2.
ENSLVTX: Bit 4 of the IEBus unit control register (BCR)
ENSLVRX: Bit 3 of the IEBus unit control register (BCR)
LOCK:
Bit 2 of the IEBus unit status register (USR)
SLVRQ:
Bit 6 of the IEBus unit status register (USR)
PAR:
IEBus partner address register