DF2398F20V Renesas Electronics America, DF2398F20V Datasheet - Page 486

• Manufacturer Part Number: DF2398F20V
• Description: IC H8S/2300 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398F20V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• For Use With: YR0K42378FC000BA - KIT EVAL FOR H8S/2378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

13.2
13.2.1
TCNT is an 8-bit readable/writable*
When the TME bit is set to 1 in TCSR, TCNT starts counting pulses generated from the internal clock source selected by
bits CKS2 to CKS0 in TCSR. When the count overflows (changes from H'FF to H'00), either the watchdog timer overflow
signal (WDTOVF)*
in TCSR.
TCNT is initialized to H'00 by a reset, in hardware standby mode, or when the TME bit is cleared to 0. It is not initialized
in software standby mode.
Notes: 1. TCNT is write-protected by a password to prevent accidental overwriting. For details see section 13.2.4,
13.2.2
Note: * Can only be written with 0 for flag clearing.
TCSR is an 8-bit readable/writable* register. Its functions include selecting the clock source to be input to TCNT, and the
timer mode.
TCR is initialized to H'18 by a reset and in hardware standby mode. It is not initialized in software standby mode.
Note: * TCSR is write-protected by a password to prevent accidental overwriting. For details see section 13.2.4, Notes on
Bit 7—Overflow Flag (OVF): Indicates that TCNT has overflowed from H'FF to H'00, when in interval timer mode. This
flag cannot be set during watchdog timer operation.
Bit 7
OVF
0
1
Rev.6.00 Oct.28.2004 page 456 of 1016
REJ09B0138-0600H
Bit
Initial value :
R/W
Bit
Initial value :
R/W
2. The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392 or
Register Access.
Register Descriptions
Timer Counter (TCNT)
Timer Control/Status Register (TCSR)
Notes on Register Access.
H8S/2390.
Description
[Clearing condition]
Cleared by reading TCSR when OVF = 1, then writing 0 to OVF
[Setting condition]
Set when TCNT overflows (changes from H'FF to H'00) in interval timer mode
:
:
:
:
R/(W)*
OVF
R/W
2
7
0
7
0
or an interval timer interrupt (WOVI) is generated, depending on the mode selected by the WT/IT bit
WT/IT
R/W
R/W
6
0
6
0
1
up-counter.
TME
R/W
R/W
5
0
5
0
R/W
—
—
4
0
4
1
R/W
—
—
3
0
3
1
CKS2
R/W
R/W
2
0
2
0
CKS1
R/W
R/W
1
0
1
0
(Initial value)
CKS0
R/W
R/W
0
0
0
0