HD64F2145BTE20 Renesas Electronics America, HD64F2145BTE20 Datasheet - Page 306
HD64F2145BTE20
Manufacturer Part Number
HD64F2145BTE20
Description
IC H8S MCU FLASH 256K 100-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2100r
Specifications of HD64F2145BTE20
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, IrDA, SCI, X-Bus
Peripherals
PWM, WDT
Number Of I /o
74
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
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
- Current page: 306 of 847
- Download datasheet (5Mb)
Section 10 14-Bit PWM Timer (PWMX)
10.4
DACNT, DADRA, and DADRB are 16-bit registers. The data bus linking the bus master and the
on-chip peripheral modules, however, is only 8 bits wide. When the bus master accesses these
registers, it therefore uses an 8-bit temporary register (TEMP).
These registers are written to and read from as follows.
Write: When the upper byte is written to, the upper-byte write data is stored in TEMP. Next,
when the lower byte is written to, the lower-byte write data and TEMP value are combined, and
the combined 16-bit value is written in the register.
Read: When the upper byte is read from, the upper-byte value is transferred to the CPU and the
lower-byte value is transferred to TEMP. Next, when the lower byte is read from, the lower-byte
value in TEMP is transferred to the CPU.
These registers should always be accessed 16 bits at a time with a MOV instruction, and the upper
byte should always be accessed before the lower byte. Correct data will not be transferred if only
the upper byte or only the lower byte is accessed. Also note that a bit manipulation instruction
cannot be used to access these registers.
Example 1: Write to DACNT
Example 2: Read DADRA
Table 10.2 Read and Write Access Methods for 16-Bit Registers
Register Name
DADRA and DADRB
DACNT
Legend:
Yes: Permitted type of access. Word access includes successive byte accesses to the upper byte
Rev. 3.00 Mar 21, 2006 page 250 of 788
REJ09B0300-0300
:
MOV.W R0, @DACNT
MOV.W @DADRA, R0
(first) and lower byte (second).
This type of access may give incorrect results.
Bus Master Interface
; Write R0 contents to DACNT
; Copy contents of DADRA to R0
Word
Yes
Yes
Read
Byte
Yes
Word
Yes
Yes
Write
Byte
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