CHAPTER 14 PORT FUNCTIONS
709
User’s Manual U14492EJ3V0UD
14.3.9 Port CT
Port CT is an 8-bit I/O port in which input or output can be specified in 1-bit units.
7
PCT7
PCT
6
PCT6
5
PCT5
4
PCT4
3
PCT3
2
PCT2
1
PCT1
0
PCT0
Address
FFFFF00AH
Initial value
Undefined
Bit Position
Bit Name
Function
7 to 0
PCTn
(n = 7 to 0)
I/O port
Besides functioning as a port, in control mode, this can operate as control signal outputs when memory is
expanded externally.
(1) Operation in control mode
Port
Alternate Pin Name
Remarks
Block type
PCT0
LWR
PCT1
UWR
Write strobe signal output
J
PCT2
PCT3
−
Fixed in port mode
E
PCT4
RD
Read strobe signal output
J
PCT5
−
Fixed in port mode
E
PCT6
ASTB
Address strobe signal output
J
Port CT
PCT7
−
Fixed in port mode
E
(2) Setting in I/O mode and control mode
Port CT is set in I/O mode using the port CT mode register (PMCT). In control mode, it is set using the port
CT mode control register (PMCCT).
(a) Port CT mode register (PMCT)
This register can be read/written in 8-bit or 1-bit units.
7
PMCT7
PMCT
6
PMCT6
5
PMCT5
4
PMCT4
3
PMCT3
2
PMCT2
1
PMCT1
0
PMCT0
Address
FFFFF02AH
Initial value
FFH
Bit Position
Bit Name
Function
7 to 0
PMCTn
(n = 7 to 0)
Specifies input/output mode of PCTn pin.
0: Output mode (output buffer on)
1: Input mode (output buffer off)
Содержание V850E/IA1 mPD703116
Страница 2: ...2 User s Manual U14492EJ3V0UD MEMO...