HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 746

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Serial data
H-UDI interrupt
request
SDTRF
(in SDSR)
SDSR and
SDDR MUX
SDDR access
state
Notes: 1. SDTRF flag (in SDSR): Indicates whether SDDR access by the CPU or serial transfer
2. SDSR/SDDR (Update-DR state) internal MUX switchover timing
*1
data input/output to SDDR is possible.
• Switchover from SDSR to SDDR: On completion of serial transfer in which
• Switchover from SDDR to SDSR: On completion of serial transfer to SDDR
*2
1
2
SDTRF = 1 is output from TDO
Conditions:
• SDTRF = 1
• SDTRF = 0
SDDR is shift-disabled. SDDR access by the CPU is enabled.
SDDR is shift-enabled. Do not access SDDR until SDTRF = 0.
— When TRST = 0
— When the CPU writes 1
— In bypass mode
— End of SDDR shift access in serial transfer
Shift
enabled
Figure 17.3 Data Input/Output Timing Chart (1)
Instruction
Shift
SDSR
SDTRF
1
SDDR
Input
disabled
Shift
CPU
0
SDSR
SDSR serial transfer
Shift
enabled
1
(monitoring)
Shift
SDDR
output
Input/
CPU
735