r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 1043
r4f2426
Manufacturer Part Number
r4f2426
Description
16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R4F2426.pdf
(1302 pages)
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19.4.3
The connection between data input/output pins and the SS shift register (SSTRSR) depends on the
combination of the MSS and BIDE bits in SSCRH and the SSUMS bit in SSCRL. Figure 19.3
shows the relationship.
The SSU transmits serial data from the SSO pin and receives serial data from the SSI pin when
operating with BIDE = 0 and MSS = 1 (standard, master mode) (see figure 19.3 (1)). The SSU
transmits serial data from the SSI pin and receives serial data from the SSO pin when operating
with BIDE = 0 and MSS = 0 (standard, slave mode) (see figure 19.3 (2)).
The SSU transmits and receives serial data from the SSO pin regardless of master or slave mode
when operating with BIDE = 1 (bidirectional mode) (see figures 19.3 (3) and (4)).
However, even if both the TE and RE bits are set to 1, transmission and reception are not
performed simultaneously. Either the TE or RE bit must be selected.
The SSU transmits serial data from the SSO pin and receives serial data from the SSI pin when
operating with SSUMS = 1. The SSCK pin outputs the internal clock when MSS = 1 and function
as an input pin when MSS = 0 (see figures 19.3 (5) and (6)).
Figure 19.3 Relationship between Data Input/Output Pins and the Shift Register
(1) When SSUMS = 0, BIDE = 0 (standard mode),
(4) When SSUMS = 0, BIDE = 1 (bidirectional mode),
(5) When SSUMS = 1 and MSS = 1
MSS = 1, TE = 1, and RE = 1
MSS = 1, and either TE or RE = 1
Relationship between Data Input/Output Pins and Shift Register
Shift register
Shift register
Shift register
(SSTRSR)
(SSTRSR)
(SSTRSR)
SSCK
SSO
SSI
SSCK
SSO
SSI
SSCK
SSO
SSI
Section 19 Synchronous Serial Communication Unit (SSU)
(2) When SSUMS = 0, BIDE = 0 (standard mode),
(3) When SSUMS = 0, BIDE = 1 (bidirectional mode),
(6) When SSUMS = 1 and MSS = 0
MSS = 0, TE = 1, and RE = 1
MSS = 0, and either TE or RE = 1
Shift register
Shift register
Shift register
(SSTRSR)
(SSTRSR)
(SSTRSR)
Rev. 1.00 Sep. 19, 2008 Page 1015 of 1270
REJ09B0466-0100
SSCK
SSO
SSI
SSCK
SSO
SSI
SSCK
SSO
SSI
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