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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
REG I Attribute memory
space select
—
62 BVD2 O Battery voltage
detection
SPKR O Digital voice signal —
63 BVD1 O Battery voltage
detection
STSCHG O Card state
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.
Bit: 15 14 13 12 11 10 9 8
PULA PULD HIZMEM HIZCNT ENDIAN A0BST1 A0BST0 A5BST1
Initial value:00000/1
*
000
R/W: R/W R/W R/W R/W R R/W R/W R/W
Bit:76543210
A5BST0 A6BST1 A6BST0 DRAM
TP2
DRAM
TP1
DRAM
TP0
A5 PCM A6 PCM
Initial value:00000000
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.