R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 565
R5F61525
Manufacturer Part Number
R5F61525
Description
32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5F61525.pdf
(846 pages)
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14.4.3
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 14.3
show 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 14.3 (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 14.3 (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 14.3 (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 14.3 (5) and (6)).
Figure 14.3 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 14 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. 3.00 Mar. 14, 2006 Page 527 of 804
REJ09B0104-0300
SSCK
SSO
SSI
SSCK
SSO
SSI
SSCK
SSO
SSI
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