h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 595

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

17.2.4
MSTPCR, comprising two 8-bit readable/writable register, performs module stop mode control.
When the MSTP2 bit is set to 1, the keyboard buffer controller halts and enters module stop mode.
See section 24.5, Module Stop Mode, for details.
MSTPCR is initialized to H'3FFF by a reset and in hardware standby mode. It is not initialized in
software standby mode.
MSTPCRL Bit 2—Module Stop (MSTP2): Specifies keyboard buffer controller module stop
mode.
17.3
17.3.1
In a receive operation, both KCLK (clock) and KD (data) are outputs on the keyboard side and
inputs on the H8S/2169 or H8S/2149 chip (system) side. KD receives a start bit, 8 data bits (LSB-
first), an odd parity bit, and a stop bit, in that order. The KD value is valid when KCLK is low. A
sample receive processing flowchart is shown in figure 17.3, and the receive timing in figure 17.4.
MSTPCRL
Bit 2
MSTP2
0
1
Bit
Initial value
Read/Write
Module Stop Control Register (MSTPCR)
Operation
Receive Operation
Description
Keyboard buffer controller module stop mode is cleared
Keyboard buffer controller module stop mode is set
MSTP15
R/W
7
0
MSTP14
R/W
6
0
MSTP13
R/W
5
1
MSTPCRH
MSTP12
R/W
4
1
MSTP11
R/W
3
1
MSTP10
R/W
2
1
MSTP9
R/W
1
1
MSTP8
R/W
0
1
Rev. 3.00 Jan 18, 2006 page 567 of 1044
MSTP7
R/W
7
1
Section 17 Keyboard Buffer Controller
MSTP6
R/W
6
1
MSTP5
R/W
5
1
MSTPCRL
MSTP4
R/W
4
1
MSTP3
R/W
3
1
REJ09B0280-0300
MSTP2
R/W
2
1
(Initial value)
MSTP1
R/W
1
1
MSTP0
R/W
0
1