tmp88cs34ng TOSHIBA Semiconductor CORPORATION, tmp88cs34ng Datasheet - Page 103

• Manufacturer Part Number: tmp88cs34ng
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Serial Bus Interface Status Register A
Serial Bus Interface Status Register B
SBISRA
(00020H)
SBISRB
(00023H)
SO pin output
Write transmitted data
SCK
(1) Serial clock
a.
Figure 2.9.20 Control Register/Data Buffer Register/Status Register in SIO Mode (2)
Note:
pin output
Figure 2.9.22 The Maximum Data Transfer Frequency in The External Clock Input
SWRMON
Clock source
1.
2.
“1”
7
7
SIOF
SEF
The SCK (bits 2 to 0 in SBICRA) is used to select the following functions.
Internal clock
is output to the outside on the
transfer starts. When writing (in the transmit mode) or reading (in the receive mode)
data cannot follow the serial clock rate, an automatic-wait function is executed to stop
the serial clock automatically and hold the next shift operation until reading or writing
is complete.
External (SCK = “111”)
ensure shift operation, a pulse width of at least 4-machine cycles is required for both
high and low levels in the serial clock. The maximum data transfer frequency is 500
KHz (fc = 16.0 MHz).
Set bit 7 to 4, bit 1 and bit 0 in SBISRB to “1”.
SCK
In an internal clock mode, any of seven frequencies can be selected. The serial clock
An external clock supplied to the
“1”
pin
6
6
t
Software reset monitor
Serial transfer operating status
monitor
Shift operating status monitor
SCKL
, t
a
SCKH
“1”
a
5
5
1
0
t
SCKL
Figure 2.9.21 Automatic Wait Function
a
> 4 tcyc
2
1
“1”
a
t
4
4
3
SCKH
2
a
5
SIOF
Automatic-wait function
a
7
3
3
6
Note: tcyc = 4/fc (in NORMAL mode, IDLE mode)
88CS34-103
8
SCK
a
0: During software reset
1: − (Initial)
0: Transfer terminated
1: Transfer in process
0: Shift operation terminated
1: Shift operation in process
7
SEF
2
2
pin. The
SCK
b
b
1
0
“1”
b
1
1
2
1
pin is used as the serial clock. In order to
c
b
SCK
4
SWR
MON
“1”
b
0
0
6
5
pin becomes a high-level when data
b
7
6
b
8
7
c
1
(Initial value: **** ***1)
0
c
2
1
c
TMP88CS34/CP34
3
2
2007-09-12
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