M306V2ME Datasheet, PDF (233/276 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
M306V2EEFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
2.17.3 Pull-up Control Registers
Figures 2.17.15 to 2.17.17 show the pull-up control registers.
The pull-up control register can be set to apply a pull-up resistance to each block of 4 ports. When ports
are set to have a pull-up resistance, the pull-up resistance is connected only when the direction register is
set for input.
However, in memory expansion mode and microprocessor mode, pull-up control register of P0 to P5 is
invalid.
2.17.4 Port Control Register
Figure 2.17.14 shows the port control register.
The bit 0 of port control register is used to read port P1 as follows:
0: When port P1 is input port, port input level is read.
When port P1 is output port, the contents of port P1 register is read.
1: The contents of port P1 register is read through port P1 is input/output port.
This register is valid in the following :
• External bus width is 8 bits in microprocessor mode or memory expansion mode.
• Port P1 can be used as a port in multiplexed bus for the entire space.
Rev. 1.0
233