Holtek HT45F23A Manual page 97

HT45F23A/HT45F24A
TinyPower Flash MCU with OPA & Comparators
TM
Register
Name
7
SIMC0 SIM2
SIMC1 HCF
SIMD D7
SIMA IICA6
SIMC0 Register
Bit 7
Name SIM2
R/W R/W
POR 1
Bit 7~5 SIM2, SIM1, SIM0: Operating Mode Control
000: SPI master mode; SPI clock is f
001: SPI master mode; SPI clock is f
010: SPI master mode; SPI clock is f
011: SPI master mode; SPI clock is f
100: SPI master mode; SPI clock is Timer 0 output/2 (PFD0)
101: SPI slave mode
110: I
111: Unused mode
These bits setup the overall operating mode of the SIM function. As well as selecting
if the I
the SPI Master clock frequency. The SPI clock is a function of the system clock but
can also be chosen to be sourced from the Timer 0. If the SPI Slave Mode is selected
then the clock will be supplied by an external Master device.
PCKEN: PCK Output Pin Control
Bit 4
0: Disable
1: Enable
Bit 3~2 PCKP1, PCKP0: Select PCK output pin frequency
00: f
01: f
10: f
11: Timer 0 output/2 (PFD0)
Bit 1 SIMEN: SIM Control
0: Disable
1: Enable
The bit is the overall on/off control for the SIM interface. When the SIMEN bit is
cleared to zero to disable the SIM interface, the SDI, SDO, SCK and SCS, or SDA
and SCL lines will be in a floating condition and the SIM operating current will be
reduced to a minimum value. When the bit is high the SIM interface is enabled. The
SIM configuration option must have first enabled the SIM interface for this bit to be
effective. If the SIM is configured to operate as an SPI interface via SIM2~SIM0 bits,
the contents of the SPI control registers will remain at the previous settings when the
SIMEN bit changes from low to high and should therefore be first initialised by the
application program. If the SIM is configured to operate as an I
SIM2~SIM0 bits and the SIMEN bit changes from low to high, the contents of the I
control bits such as HTX and TXAK will remain at the previous settings and should
therefore be first initialised by the application program while the relevant I
such as HCF, HAAS, HBB, SRW and RXAK will be set to their default states.
Bit 0 unimplemented, read as "0"
Rev. 1.40
6 5 4
SIM1 SIM0 PCKEN
HAAS HBB HTX
D6 D5 D4
IICA5 IICA4 IICA3
I C Registers List
2
6 5 4
SIM1 SIM0 PCKEN
R/W R/W R/W
1 1 0
C slave mode
2
C or SPI function, they are used to control the SPI Master/Slave selection and
2
SYS
/4
SYS
/8
SYS
97
Bit
3 2 1
PCKP1 PCKP0 SIMEN
TXAK SRW IAMWU
D3 D2 D1
IICA2 IICA1 IICA0
3 2 1
PCKP1 PCKP0 SIMEN
R/W R/W R/W
0 0 0
/4
SYS
/16
SYS
/64
SYS
SUB
C interface via the
2
0
—
RXAK
D0
—
0
—
—
—
C
2
C flags
2
March 29, 2019