SH7720 Datasheet, PDF (1086/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 30 SIM Card Module (SIM)
Normal operation
Standby mode
Normal operation
SIM_CLK
(1) (2) (3)
(4)
(5) (6) (7)
Figure 30.10 Procedure for Stopping Clock and Restarting
(4) Power-On and Clock Output
In order to retain the clock duty from power-on, the following switching procedure should be
used.
1. The initial state is set to port-input with high impedance. In order to fix the potential, a pull-up
resistance/pull-down resistance is used.
2. Use the CKE1 bit in the serial control register (SCSCR) to fix the specified output.
3. Set the CKE0 bit in SCSCR to 1 to start clock output.
Rev. 3.00 Jan. 18, 2008 Page 1024 of 1458
REJ09B0033-0300