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SERIAL INTERFACE
12
12-6
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
12.2.1 SIO Interrupt Related Registers
The SIO interrupt related registers are used to control the interrupt request signals output from SIO to the
Interrupt Controller (ICU), as well as select the source of each interrupt request.
(1) Interrupt request status bit
This status bit is used to determine whether an interrupt is requested. When an interrupt request occurs,
this bit is set in hardware (cannot be set in software). The status bit is cleared by writing "0." Writing "1"
has no effect; the bit retains the status it had before the write. Because this bit is unaffected by the
interrupt request mask bit, it can also be used to inspect the operating status of peripheral functions.
In interrupt handling, make sure that within the grouped interrupt request status, only the status bit for the
interrupt request that has been serviced is cleared. If the status bit for any interrupt request that has not
been serviced is cleared, the pending interrupt request is cleared simultaneously with its status bit.
(2) Interrupt request mask bit
This bit is used to disable unnecessary interrupt requests within the grouped interrupt request. Set
this bit to "1" to enable interrupt requests or "0" to disable interrupt requests.
Figure 12.2.1 Interrupt Request Status and Mask Registers
To the Interrupt Controller
Interrupt request from
each peripheral function
Interrupt request status
Data bus
Set
Group interrupt
Interrupt request mask
clear
F/F
Data=0
Serial Interface Related Register Map (2/2)
Address
+0 address
+1 address
See
b0
b7 b8
b15
pages
H'0080 0A18
SIO4 Special Mode Register
(Use inhibited area)
12-27
(S4SMOD)
|
(Use inhibited area)
H'0080 0A20
SIO5 Transmit Control Register
SIO5 Transmit/Receive Mode Register
12-14
(S5TCNT)
(S5MOD)
12-15
H'0080 0A22
SIO5 Transmit Buffer Register
12-19
(S5TXB)
H'0080 0A24
SIO5 Receive Buffer Register
12-20
(S5RXB)
H'0080 0A26
SIO5 Receive Control Register
SIO5 Baud Rate Register
12-21
(S5RCNT)
(S5BAUR)
12-24
H'0080 0A28
SIO5 Special Mode Register
(Use inhibited area)
12-27
(S5SMOD)
12.2 Serial Interface Related Registers