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HD6433644R Datasheet(PDF) 199 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 199 Page - Renesas Technology Corp

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Section 8 I/O Ports
Rev. 6.00 Sep 12, 2006 page 179 of 526
REJ09B0326-0600
8.3.3
Pin Functions
Table 8.6 shows the port 2 pin functions.
Table 8.6
Port 2 Pin Functions
Pin
Pin Functions and Selection Method
P22/TXD
The pin function depends on bit TXD in PMR7 and bit PCR22 in PCR2.
TXD
0
1
PCR22
0
1
*
Pin function
P22 input pin P22 output pin
TXD output pin
P21/RXD
The pin function depends on bit RE in SCR3 and bit PCR21 in PCR2.
RE
0
1
PCR21
0
1
*
Pin function
P21 input pin P21 output pin
RXD input pin
P20/SCK3
The pin function depends on bits CKE1 and CKE0 in SCR3, bit COM in SMR,
and bit PCR20 in PCR2.
CKE1
0
1
CKE0
0
1
*
COM
0
1
*
*
PCR20
0
1
*
*
Pin function
P20 input pin P20 output pin SCK3 output
pin
SCK3 input pin
Legend: * Don’t care
8.3.4
Pin States
Table 8.7 shows the port 2 pin states in each operating mode.
Table 8.7
Port 2 Pin States
Pins
Reset
Sleep
Subsleep Standby
Watch
Subactive Active
P22/TXD
P21/RXD
P20/SCK3
High-
impedance
Retains
previous
state
Retains
previous
state
High-
impedance
Retains
previous
state
Functional Functional



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