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Application Note

The Z180™ Interfaced with the SCC at MHZ

7-28

(Continued)

Table 14 lists a program example for the Z180/SCC DMA transfer test.

Table 14. Test Program – Z180/SCC DMA Transfer

;

;* Test program for 180 DMA/SCC

;* Test 180’s DMA function with SCC

;* 180 dma - dma0 for scc rx data

;* dma1 for scc tx data

;* async, X1 mode, 1 stop, speed = pclk/4

;* self loop-back

;* Connect W/REQ to DREQ0 of 180

;* DTR/REQ to DREQ1 of 180

;* B register returns status info:

;* Bit D0 set : Tx DMA end

;* D1 set : Rx DMA end

;* D2 set : Data doesn’t match

.z800

; Read in Z180 register names and

*include 180macro.lib ;macro for Z180 new instructions

;SCC Registers

scc_ad: equ 0C3h ;addr of scc ch a - data

scc_ac: equ 0C2h ;addr of scc ch a - control

scc_bd: equ 0C1h ;addr of scc ch b - data

scc_bc: equ 0C0h ;addr of scc ch b - control

scc_a: equ 00h ;if test ch. a, set this to 0ffh

;for ch.b, set this to 00h

if scc_a

scc_cont: equ scc_ac

scc_data: equ scc_ad

else

scc_cont: equ scc_bc

scc_data: equ scc_bd

endif

length: equ 1000h ;transfer length

org 09000h ;top of user ram area

sccdma: ld sp,tx_buff ;init sp

ld a,(high z180vect) and 0ffh ;init i reg

ld i,a

ld a,00h ;init il

out0 (il),a

im 2 ;Set interrupt mode 2

call ﬁll_mem ;initialize tx/rx buffer area

call initscc ;initialize scc

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