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7641 Datasheet(PDF) 248 Page - Renesas Technology Corp |
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7641 Datasheet(HTML) 248 Page - Renesas Technology Corp |
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248 / 385 page  Rev.2.00 Aug 28, 2006 page 117 of 148 7641 Group REJ09B0336-0200 APPLICATION 2.9 Special count source generator (SCSG) 2.9.2 Related registers Fig. 2.9.2 Structure of Special count source generator 1 Special count source generator 1 b7 b6 b5 b4 b3 b2 b1 b0 Special count source generator 1 (SCSG1: address 2D16) b 0 1 Functions At reset R W 1 1 2 1 3 1 4 1 5 1 6 1 7 1 qThis is a 8-bit down-count timer. The division ratio : 1 / (n1 +1), n1: value set to SCSG1. Fig. 2.9.3 Structure of Special count source generator 2 Special count source generator 2 b7 b6 b5 b4 b3 b2 b1 b0 Special count source generator 2 (SCSG2: address 2E16) b 0 1 Functions At reset R W 1 1 2 1 3 1 4 1 5 1 6 1 7 1 qThis is a 8-bit down-count timer. An output from SCSG1 is divided by the contents of SCSG2 to generate SCSGCLK. qThe count source, an output from SCSG1, is φ • n1 / (n1 +1). qSCSGCLK frequency: φ • n1 / (n1 +1) • 1 / (n2 +1) n1: value set to SCSG1 n2: value set to SCSG2 |
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