HD6417616 RENESAS [Renesas Technology Corp], HD6417616 Datasheet - Page 305

• Manufacturer Part Number: HD6417616
• Description: 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

When the CMIE bit in RTCSR is set to 1, an interrupt request is sent to the controller by this
match signal. The interrupt request is output continuously until the CMF bit in RTCSR is cleared.
When the CMF bit clears, it only affects the interrupt; the refresh request is not cleared by this
operation. When a refresh is performed and refresh requests are counted using interrupts, a refresh
can be set simultaneously with the interval timer interrupt.
Bits 15 to 8—Reserved: These bits are always read as 0. The write value should always be 0.
7.3
7.3.1
Byte, word, and longword are supported as access units Data is aligned based on the data width of
the device Therefore, reading longword data from a byte-width device requires four read
operations The bus state controller automatically converts data alignment and data length between
interfaces. An 8-bit, 16-bit, or 32-bit external device data width can be connected by using the
mode pins for the CS0 space, or by setting BCR2 for the CS1–CS4 spaces. However, the data
width of devices connected to the respective spaces is specified statically, and the data width
cannot be changed for each access cycle. Figures 7.5 to 7.7 show the relationship between device
data widths and access units.
A24–A0
000000
000001
000002
000003
000000
000002
000000
Access Size and Data Alignment
Connection to Ordinary Devices
D31
15
7
31
Figure 7.5 32-Bit External Devices and Their Access Units
32-bit external device (ordinary)
24
0
8
D23
7
7
23
16
0
0
D15
15
15
7
0
8 7
8 7
D7
7
D0
Rev. 2.00 Mar 09, 2006 page 279 of 906
0
0
0
Section 7 Bus State Controller (BSC)
Data input/output pin
Byte read/write of address 0
Byte read/write of address 1
Byte read/write of address 2
Byte read/write of address 3
Word read/write of address 0
Word read/write of address 2
Longword read/write of address 0
REJ09B0292-0200