HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 214
HD6477021X20V
Manufacturer Part Number
HD6477021X20V
Description
MCU 5V 32K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet
1.HD6417020SVX12IV.pdf
(511 pages)
Specifications of HD6477021X20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
OTP
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6477021X20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Bus Modes: There are two bus modes: cycle steal and burst. Select the mode in the TM bits of
CHCR0–CHCR3.
•
Figure 9.9 DMA Transfer Timing in the Dual Address Mode (External memory space to
Transfer requests can be auto requests, external requests, or on-chip peripheral module
requests. When the transfer request source is either the SCI or A/D converter, however, either
the data destination or source must be the SCI or A/D converter (figure 9.4), In dual address
mode, DACK is output in read or write cycles to onchip memory or onchip peripheral
modules. The CHCR controls the cycle of DACK output.
Figure 9.9 shows the DMA transfer timing in the dual address mode.
Cycle-Steal Mode
In the cycle steal mode, the bus right is given to another bus master after a one-transfer-unit
(word or byte) DMA transfer. When another transfer request occurs, the bus rights are obtained
from the other bus master and a transfer is performed for one transfer unit. When that transfer
ends, the bus right is passed to the other bus master. This is repeated until the transfer end
conditions are satisfied.
The cycle steal mode can be used with all categories of transfer destination, transfer source and
transfer request. Figure 9.10 shows an example of DMA transfer timing in the cycle steal
mode. Transfer conditions shown in the figure are:
Dual address mode
DREQ level detection
external memory space transfer with DACK output in the read cycle)
D15–D0
A21–A0
DACK
WRH
WRL
CSn
RD
CK
Source address
Destination address
RENESAS 195
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