Holtek HT66F20 Manual page 193

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
I C Registers
2
There are three control registers associated with the I
data register, SIMD. The SIMD register, which is shown in the above SPI section, is used to store
the data being transmitted and received on the I
the I C bus, the actual data to be transmitted must be placed in the SIMD register. After the data is
2
received from the I
or reception of data from the I
Note that the SIMA register also has the name SIMC2 which is used by the SPI function. Bit SIMEN
and bits SIM2~SIM0 in register SIMC0 are used by the I
Register
Name
7
SIMC0 SIM2
SIMC� HCF
SIMD D�
SIMA IICA6
Rev. 2.50
S T A R T s i g n a l
f r o m M a s t e r
S e n d s l a v e a d d r e s s
a n d R / W b i t f r o m
A c k n o w l e d g e
f r o m s l a v e
S e n d d a t a b y t e
f r o m M a s t e r
A c k n o w l e d g e
f r o m s l a v e
S T O P s i g n a l
f r o m M a s t e r
2
C bus, the microcontroller can read it from the SIMD register. Any transmission
2
C bus must be made via the SIMD register.
2
6 5 4
SIM� SIM0 PCKEN
HAAS HBB HTX
D6 D5 D4
IICA5 IICA4 IICA3
I C Registers List
2
�93
M a s t e r
C bus, SIMC0, SIMC1 and SIMA and one
2
C bus. Before the microcontroller writes data to
C interface.
2
Bit
3 2
PCKP� PCKP0 SIMEN
TXAK SRW IAMWU
D3 D2
IICA2 IICA� IICA0
1 0
—
RXAK
D� D0
D0
��ne 22� 20��