upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 551

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Clocked Serial Interface (CSIB)
Initial Value
Initial Value
Address
Address
Access
Access
Note
(5)
(6)
CBnRX - CSIBn receive data register
The CBnRX register is a 16-bit buffer register that holds receive data.
This register can be read-only in 16-bit units.
If the transfer data length is 8 bits, the lower 8 bits of this register are read-only
in 8-bit units as the CBnRXL register.
<base> + 4
0000
In addition to reset input, the CBnRX register can be initialized by clearing (to
0) the CBnPWR bit of the CBnCTL0 register.
The receive operation is started by reading the CBnRX register in the
reception enabled status.
CBnTX - CSIB transmit data register
The CBnTX register is a 16-bit buffer register used to write the CSIBn transfer
data.
This register can be read/written in 16-bit units.
If the transfer data length is 8 bits, the lower 8 bits of this register are read/write
in 8-bit units as the CBnTXL register.
<base> + 6
0000
In addition to reset input, the CBnTX register can be initialized by clearing (to
0) the CBnPWR bit of the CBnCTL0 register.
The transmit operation is started by writing data to the CBnTX register in the
transmission enabled status.
The communication start conditions are shown below:
• Transmission mode (CBnTXE bit = 1, CBnRXE bit = 0):
• Transmission/reception mode (CBnTXE bit = 1, CBnRXE bit = 1):
• Reception mode (CBnTXE bit = 0, CBnRXE bit = 1):
Preliminary User’s Manual U17566EE1V2UM00
15
15
H
H
14
14
. This register is cleared by any reset.
. This register is cleared by any reset.
13
13
H
H
Write to CBnTX register
Write to CBnTX register
Read from CBnRX register
12
12
11
11
10
10
9
9
Transmit data
Receive data
8
8
R/W
R
7
7
6
6
5
5
4
4
3
3
2
2
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