NEC V850E/PH2, User Manual

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Chapter 20 Port Functions
User’s Manual U16580EE3V1UD00
(2) Control registers
(a) Port register 2 (P2)
The P2 register is an 8-bit register that controls reading the pin levels and writing the output levels
of port pins P20 to P27.
This register can be read or written in 8-bit or 1-bit units.
Reset input causes an undefined register content.
Figure 20-27: Port Register 2 (P2)
Remark: n = 0 to 7
(b) Port mode register 2 (PM2)
The PM2 register is an 8-bit register that specifies the input or output mode.
This register can be read or written in 8-bit or 1-bit units.
Reset input sets this register to FFH.
Figure 20-28: Port Mode Register 2 (PM2)
Remark: n = 0 to 7
PM2 is an 8 bit read/write register. It is the port mode register of Port 2. PM2 determines the input or
output direction of the respective port pin.
After reset: Undefined R/W Address: FFFFF404H
7 6 5 4 3 2 1 0
P2 P27 P26 P25 P24 P23 P22 P21 P20
P2n Input/Output Data Control of Pin P2n
0 Input mode: Low level is input
Output mode: Low level is output
1 Input mode: High level is input
Output mode: High level is output
After reset: FFH R/W Address: FFFFF424H
7 6 5 4 3 2 1 0
PM2 PM27 PM26 PM25 PM24 PM23 PM22 PM21 PM20
PM2n Input/Output Mode Control of Pin P2n (in Port Mode)
0 Output mode
1 Input mode