7641_06 Datasheet, PDF (248/385 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

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