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Register Descriptions
A-6
’C2xx Interrupt Flag Register (IFR) — Except ’C209 — Data-Memory Address 0006h
15 6 5 4 3 2 1 0
0 0 0 0 0 0 0
Reserved
†
TXRXINT XINT RINT TINT INT2/INT3 HOLD/INT1
R/W1C
Neither INT2 nor INT3 pending
INT2 and/or INT3 pending
0
1
Interrupt TXRXINT not pending
Interrupt TXRXINT pending
0
1
Interrupt XINT not pending
Interrupt XINT pending
0
1
Interrupt RINT not pending
Interrupt RINT pending
0
1
Interrupt TINT not pending
Interrupt TINT pending
0
1
0
1
HOLD
/INT1 not pending
HOLD
/INT1 pending
R/W1C R/W1C R/W1C R/W1C R/W1C
Receive interrupt flag
Transmit interrupt flag
Transmit/receive interrupt flag
HOLD
/INT1 flag
Timer interrupt flag
INT2
/INT3 flag
†
These reserved bits are always read as 0s. Writes have no effect.
Interrupt Flag Register (IFR) — ’C209 — Data-Memory Address 0006h
15 4 3 2 1 0
0 0 0 0 0
Reserved
†
TINT INT3 INT2 INT1
R/W1CR/W1C
INT2 not pending
INT2 pending
0
1
Interrupt TINT not pending
Interrupt TINT pending
0
1
INT3
not pending
INT3 pending
0
1
0
1
INT1
not pending
INT1
pending
R/W1C R/W1C
INT1 flag
Timer interrupt flag
INT2 flag
INT3
flag
†
These reserved bits are always read as 0s. Writes have no effect.