Holtek HT66F488 Manual page 125

HT66F488/HT66F489
A/D Flash MCU with EEPROM
SIMD Register
Bit 7
�a�e D�
R/W R/W
POR ×
SIMA Register
Bit
�a�e A6
R/W R/W
POR
bit 7 ~ 1 A6~ A0: I
A6~ A0 is the I
The SIMA register is also used by the SPI interface but has the name SIMC2. The
SIMA register is the location where the 7-bit slave address of the slave device is
stored. Bits 7~1 of the SIMA register define the device slave address. Bit 0 is not
defined. When a master device, which is connected to the I
address, which matches the slave address in the SIMA register, the slave device will
be selected. Note that the SIMA register is the same register address as SIMC2 which
is used by the SPI interface.
Bit 0 Undefined bit
This bit can be read or written by user software program.
A d d r e s s M a t c h
S I M T O E N
T i m e - o u t
f
C o n t r o l
S U B
f
S Y S
S C L P i n D e b o u n c e
C i r c u i t r y
S D A P i n
M
U
X
S I M D B N C 1
&
S I M D B N C 0
Rev. 1.21
6 5
D6 D5
R/W R/W
× ×
7 6 5
A5 A4
R/W R/W
� � �
C slave address
2
C slave address bit 6 ~ bit 0.
2
I C D a t a R e g i s t e r
2
( S I M D )
S I M T O F
H T X B i t
D i r e c t i o n C o n t r o l
D a t a I n
S h i f t R e g i s t e r
D a t a O u t
T X A K
T r a n s m i t / R e c e i v e
C o n t r o l U n i t
I C Block Diagram
2
125
4 3 2
D4 D3 D2
R/W R/W R/W
× × ×
4 3 2
A3 A2 A1
R/W R/W R/W
� � �
2
D a t a B u s
S l a v e A d d r e s s R e g i s t e r
( S I M A )
A d d r e s s M a t c h
A d d r e s s H A A S B i t
C o m p a r a t o r
S I M T O F b i t
R e a d / w r i t e S l a v e
S R W B i t
8 - b i t D a t a C o m p l e t e H C F B i t
D e t e c t S t a r t o r S t o p
H B B B i t
1 0
D1 D�
R/W R/W
× ×
"×": unknown
1 0
A� —
R/W —
� —
C bus, sends out an
I C I n t e r r u p t
2
�ove��e� ��� 2�1�