Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 235 of 760
IC Memory Card Interface
I/O Card Interface
Pin Signal
I/O
Function
Signal
I/O
Function
SH7709S Pin
61
REG
I
Attribute memory
space select
space select
REG
I
Attribute memory
space select
space select
—
62
BVD2
O
Battery voltage
detection
detection
SPKR
O
Digital voice signal —
63
BVD1
O
Battery voltage
detection
detection
STSCHG
O
Card state
change
change
—
64
D8
I/O
Data
D8
I/O
Data
D8
65
D9
I/O
Data
D9
I/O
Data
D9
66
D10
I/O
Data
D10
I/O
Data
D10
67
CD2
O
Card detection
CD2
O
Card detection
—
68
GND
Ground
GND
Ground
—
10.2
BSC Registers
10.2.1
Bus Control Register 1 (BCR1)
Bus control register 1 (BCR1) is a 16-bit readable/writable register that sets the functions and bus
cycle state for each area. It is initialized to H'0000 by a power-on reset, but is not initialized by a
manual reset or in standby mode. Do not access external memory outside area 0 until BCR1
register initialization is complete.
cycle state for each area. It is initialized to H'0000 by a power-on reset, but is not initialized by a
manual reset or in standby mode. Do not access external memory outside area 0 until BCR1
register initialization is complete.
Bit:
15
14
13
12
11
10
9
8
PULA
PULD
HIZMEM HIZCNT ENDIAN A0BST1 A0BST0 A5BST1
Initial value:
0
0
0
0
0/1
*
0
0
0
R/W:
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
A5BST0 A6BST1 A6BST0
DRAM
TP2
DRAM
TP1
DRAM
TP0
A5 PCM A6 PCM
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note:
*
Samples the value of the external pin (MD5) designating the endian in a power-on reset.