HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 413

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Note:
Bit
15 to 9 
8
7, 6
5
4 to 2 
1
0
*
Bit Name
UNF

UNIE
TPSC1
TPSC0
Only 0 can be written for flag clearing.
Initial
Value
All 0
0
All 0
0
All 0
0
0
R/W
R
R/(W)* Underflow Flag
R
R/W
R
R/W
R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0. If 1 is written to these bits, correct operation
cannot be
Status flag that indicates occurrence of a TCNT underflow.
0: TCNT has not underflowed
[Clearing condition]
0 is written to UNF
1: TCNT has underflowed
[Setting condition]
TCNT underflows
Reserved
These bits are always read as 0. The write value should
always be 0. If 1 is written to these bits, correct operation
cannot be
Underflow Interrupt Control
Controls enabling of interrupt generation when the status
flag (UNF) indicating TCNT underflow has been set to 1.
0: Interrupt due to UNF (TUNI) is disabled
1: Interrupt due to UNF (TUNI) is enabled
Reserved
These bits are always read as 0. The write value should
always be 0. If 1 is written to these bits, correct operation
cannot be guaranteed.
Timer Prescaler 1 and 0
Select the TCNT count clock.
00: Count on Pφ/4
01: Count on Pφ/16
10: Count on Pφ/64
11: Count on Pφ/256
guaranteed.
guaranteed.
Rev. 1.00, 02/04, page 375 of 804