Casio CTK-620L Service Manual

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CPU (LSI1: GT913F)
The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.
The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from
the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with
the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the
CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores
sequencer data into the working storage RAM.
The following table shows the pin functions of LSI1.
.oNniPlanimreTtuO/nInoitcnuF
10DXTtuOdesutoN
20DXRnIdesutoN
30KCStuOtuptuolangis)ffOrewoPotuA(OPA
41DXTtuOtuptuolangisIDIM
51DXRnItupnilangisIDIM
61KCStuOtuptuoeslupgnizinorhcnysZHM1
7CCVAnIecruos)V5+(DDVD
80NAnI
.lanimretnoitcetedrotpadaCA
dnaseirettabybderewopsidraobyekehtnehwV5+
CAnehwnoitcnufOPAehtlecnacotV0semoceb
.detcennocsirotpada
91NA— .dnuorgotdetcennoC.desutoN
01DNGAnIecruos)V0(dnuorG
11KCBtuOtuptuokcolctiB
21OStuOtuptuoataddnuoslaireS
31KCRLtuOtuptuokcolcdroW
41DNGnIecruos)V0(dnuorG
61,511TLX,0TLXtuO/nItuptuo/tupnikcolczHM03
71CCVnIecruosV5+
91,811DM,0DMnIlanimretnoitcelesedoM
02BTSRnItupnilangisteseR
12IMNnItupnilangisNOrewoP
2201P/TNItuO/nIrevirdDCLehtrofsubataD
03~32
3IF~0IF
3IS~0IS
nIlangistupniyekroflanimreT
83~137CK~0CKtuOlangisnacsyekroflanimreT
64~93
7IF~4IF
7IS~4IS
nIlangistupniyekroflanimreT
84,748IS,8IF—desutoN
949IFnIlangistupninottubroflanimreT
059ISnIrevirdDCLrofsubataD
1501IFnIlangistupninottubroflanimreT
2532P/01IStuOrevirdDCLehtrofsubataD
55~352IK~0IKnIlangistupninottubroflanimreT
65BNWMtuOPSDehtroflangiselbaneetirW

Casio CTK-620L Specifications

General

Brand	Casio
Model	CTK-620L
Category	Electronic Keyboard
Language	English