Maxim Integrated 71M6513H Power Meter IC Family Software - Manual (Page 52)

71M651x Software User’s Guide
es0_isr
Enable transmitter
rx==XON_
Flow control enabled && flow
control received.
RX interrupt
RI == TRUE?
RI=FALSE
rx0_status = S_OVERRUN
*rx0_head++ = rx0
rx0_free--
rx0=SBUF
rx=rx0 & 0x7F
xon_xoff_0 &&
(XON_ == rx || XOF_ ==
rx
tx0_stop ==TRUE
tx0_stop = FALSE
TI=TRUE
tx0_flow = TRUE
rx==XOF_
tx0_flow = FALSE
S_FULL == rx0_status
|| S_OVERRUN ==
rx0_status
Y
Y
Y
Y Y
Y
N
N
N
A = rx0
parity_none_0 == 0?
Y
seven_bit0 ==TRUE
parity_none_0 == 0?
rx0_status=S_PARITY ERR
P != parity_odd_0?
rx0 &=0x7F
A = rx0
rx0_status=S_PARITY ERR
(RB8 ^ P) != parity_odd_0?
rx0_head = rx0_begin
rx0_head == rx0_end?
rx0_status = S_FULL
rx0_head == rx0_tail?
xon_xoff_0 && rx0_flow?
rx0_flow_off()
rx0_free < rx0_sixe_4?
TI == TRUE?
TI = FALSE
tx0_now()
rx=rx0 & 0x7F
Y
tx0?
tx0_status = S_EMPTY
tx0_done?
tx0_stop = TRUE
tx0 = *(tx0_tail++)
tx0_flow?
tx0_now()
tx0_tail = tx0_begin
tx0_tail ==tx0_end?
tx0_done = tx0_tail == tx0_head
tx0_status = S_PENDING
tx0_stop = TRUE
tx0_tail ==tx0_end?
END
TX interrupt
Figure 5-10: Serial 0 isr
Revision 2.4 TERIDIAN Proprietary 52 of 137
© Copyright 2005-2006 TERIDIAN Semiconductor Corporation