HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 254

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

• Bit 1 (input capture/compare match B (IMFB)): IMFB indicates a GRB compare match or
Bit 1: IMFB
0
1
• Bit 0 (input capture/compare match A (IMFA)): IMFA indicates a GRA compare match or
Bit 0: IMFA
0
1
10.2.12 Timer Interrupt Enable Register (TIER)
The timer status interrupt enable register (TIER) is an eight-bit read/write register that controls
enabling/disabling of overflow interrupt requests and general register compare match/input capture
interrupt requests. TIER is initialized by a reset or standby mode to H'F8 or H'78. Each ITU
channel has one TIER (table 10.10).
Table 10.10 Timer Interrupt Enable Register (TIER)
Channel
0
1
2
3
4
240 HITACHI
input capture.
input capture.
Abbreviation
TIER0
TIER1
TIER2
TIER3
TIER4
Description
Clearing condition: Read IMFB when IMFB = 1, then write 0 in IMFB
(initial value)
Setting condition:
• GRB is functioning as an output compare register and TCNT = GRB
• GRB is functioning as an input capture register and the value of
Description
Read IMFA when IMFA = 1, then write 0 in IMFA (initial value).
Clearing condition: DMAC is activated by an IMIA interrupt (only
channels 0–3)
Setting condition:
• GRA is functions as an output compare register and TCNT = GRA
• GRA is functioning as an input capture register and the value of
TCNT is transferred to GRB by an input capture signal
TCNT is transferred to GRA by an input capture signal
Function
The TIER controls interrupt enable/disable.