HD6417712BPV Renesas Electronics America, HD6417712BPV Datasheet - Page 542

• Manufacturer Part Number: HD6417712BPV
• Description: MPU 1.5/3.3V 0K PB-FREE 256-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Ethernetr

Specifications of HD6417712BPV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, FIFO, SCI, SIO
• Peripherals: DMA, POR, WDT
• Number Of I /o: 24
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 14 Timer Unit (TMU)
14.2.2
The timer control registers (TCR) control the timer counters (TCNT) and interrupts. The TMU has
three TCR registers, one for each channel.
The TCR registers control the issuance of interrupts when the flag indicating timer counters
(TCNT) underflow has been set to 1, and also carry out counter clock selection.
The TCR registers are 16-bit readable/writable registers. They are initialized to H'0000 by a
power-on reset and manual reset, but are not initialized, and retain their contents, in standby mode.
Rev. 1.00 Dec. 27, 2005 Page 498 of 932
REJ09B0269-0100
Bit
0
Bit
15 or 9 
8
7, 6
Bit Name
STR0
Bit Name
UNF

Timer Control Registers (TCR)
Initial Value
0
Initial Value R/W
All 0
0
All 0
R/W
R/W
R
R/W
R
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Underflow Flag
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*
Note: * Contents do not change when 1 is written to
Reserved
These bits are always read as 0. The write value
should always be 0.
Description
Counter Start 0
Selects whether to run or halt TCNT0.
0: TCNT0 count halted
1: TCNT0 counts
UNF.