38K0 Datasheet, PDF (60/133 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

38K0 Group
b7
000
b0
Index = 0016 : External I/O configuration register (EXBCFGL) [address 003416]
Bit symbol
Bit name
EXB_CTR
INT_CTR
[2:0]
EXB pin control bit
(Pins P10 to P17, P30 to P34)
P33/ExINT pin control bit
A1_CTR
b7:b5
P43/ExA1 pin control bit
Not used
Function
At reset _{R W}
H/W S/W
0 : Port
1 : EXB function pin
0 – OO
Selects a signal of P33/ExINT pin.
0
ON/OFF is programmed by each bit. An output logical
– OO
sum of P33/ExINT pins set for ON are performed and it
is output as an “L” active signal.
b3b2b1
0 0 1 : RxB_RDY (RxBuf ready) output
0 1 0 : TxB_RDY (TxBuf ready) output
1 0 0 : Mch_req (Memory channel request) output
Others : Do not set.
0 : Port
1 : A1 input (used to read status)
0 – OO
Write “0” when writing.
“0” is read when reading.
– – OO
–: State remaining
Fig. 84 Index00[low]; Structure of External I/O configuration register
b7
000
b0
Index = 0016 : External I/O configuration register (EXBCFGH) [address 003516]
Bit symbol
Bit name
DRQ_CTR P40/ExDREQ/RxD pin control
[1:0]
bit
DAK_CTR P41/ExDACK/TxD pin control
[1:0]
bit
Function
At reset _{R W}
H/W S/W
b1b0
0 0 : Port
0 – OO
0 1 : Do not set.
1 0 : ExDREQ function; RxB_RDY (RxBuf ready) output
1 1 : ExDREQ function; Mch_req (Memory channel
request) output
Specifies P41/ExDACK/TxD pin function.
0
Selects which mode; requiring read or write signal, or
– OO
not requiring it for use of DMA acknowledge function.
TC_CTR
b7:b5
P42/ExTC/SCLK pin control bit
Not used
b3b2
0 0 : Port
0 1 : Do not set.
1 0 : ExDACK function; DMA acknowledge input
(Mode for read and write signals used together)
1 1 :ExDACK function; DMA acknowledge input
(Mode for read and write signals not required)
0 : Port
0
1 : ExTC (terminal count) input
Write “0” when writing.
–
“0” is read when reading.
– OO
– OO
–: State remaining
Fig. 85 Index00[high]; Structure of External I/O configuration register
Rev.3.00 Oct 05, 2006 page 60 of 129
REJ03B0192-0300