DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 482

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

15.5
15.5.1
TCNT and TCSR differ from other registers in being more difficult to write to. The procedures for
writing to and reading from these registers are given below.
(1) Writing to TCNT and TCSR
These registers must be written to by a word transfer instruction. They cannot be written to by a
byte transfer instruction.
TCNT and TCSR both have the same write address. Therefore, satisfy the relative condition
shown in figure 15.6 to write to TCNT or TCSR. To write to TCNT, the upper bytes must contain
the value H′5A and the lower bytes must contain the write data before the transfer instruction
execution. To write to TCSR, the upper bytes must contain the value H′A5 and the lower bytes
must contain the write data before the transfer instruction execution.
(2) Reading from TCNT and TCSR
These registers are read in the same way as other registers. The read address is H'FFBC for TCSR
and H'FFBD for TCNT.
Rev.2.00 May. 28, 2009 Page 442 of 732
REJ09B0059-0200
<TCNT write>
<TCSR write>
Usage Notes
Notes on Register Access
Address :
Address :
H'FFBC
H'FFBC
Figure 15.6 Writing to TCNT and TCSR
15
15
H'5A
H'A5
8 7
8 7
Write data
Write data
0
0