HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 417

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

PACR2:
• Bit 15 (reserved): This bit always reads as 1. The write value should always be 1.
• Bit 14 (PA7 mode (PA7MD)): PA7MD selects the function of the PA7/BACK pin.
Bit 14: PA7MD
0
1
• Bit 13 (reserved): This bit always reads as 1. The write value should always be 1.
• Bit 12 (PA6 mode (PA6MD)): PA6MD selects the function of the PA6/RD pin.
Bit 12: PA6MD
0
1
• Bit 11 (reserved): This bit always reads as 1. The write value should always be 1.
• Bit 10 (PA5 mode (PA5MD)): PA5MD selects the function of the PA5/WRH (LBS) pin.
Bit 10: PA5MD
0
1
• Bit 9 (reserved): This bit always reads as 1. The write value should always be 1.
Initial value:
Initial value:
Bit name:
Bit name: PA3MD1 PA3MD0 PA2MD1 PA2MD0 PA1MD1 PA1MD0 PA0MD1 PA0MD0
R/W:
R/W:
Bit:
Bit:
Function
Input/output (PA7)
Bus request acknowledge output (BACK) (initial value)
Function
Input/output (PA6)
Read output (RD) (initial value)
Function
Input/output (PA5)
Upper write output (WRH) or lower byte strobe output (LBS) (initial value)
R/W
15
—
—
1
7
1
PA7MD
R/W
R/W
14
1
6
0
R/W
13
—
—
1
5
0
PA6MD
R/W
R/W
12
1
4
1
R/W
11
—
—
1
3
0
PA5MD
R/W
R/W
10
1
2
1
R/W
—
—
9
1
1
0
HITACHI 405
PA4MD
R/W
R/W
8
1
0
1